US3842196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for transmission of auxiliary information in a video spectrum
Assignee: Hazeltine Research Inc
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Filing: 1973-11-12
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Granted: 1974-10-15
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Expires: 1993-11-12
Abstract
Abstract Described is a system for compatibly transmitting and receiving both a color TV and an add-on signal within the frequency band normally occupied by the TV signal alone. To reduce mutual interference between the two signals the system utilizes an addon signal whose frequency is preferably between the normal location of the luminance and chrominance frequencies of the TV signal. To further reduce such interference the add-on signal is intentionally made redundant and of an opposite polarity during pairs of time successive line intervals, so that when the received combined signal is detected and displayed in a conventional TV receiver the add-on information tends to visually cancel in the displayed image. In order to reliably and accurately recover the add-on information, processing means are included for accepting the received combined signal and causing the redundant add-on information contained therein to reinforce while at the same time causing any redundant video information contained therein to tend to cancel, thus providing an output signal primarily representative of the add-on information.
Inventors
- 👤 B Loughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:50
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/081
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
258 words
A system for compatibly transmitting and receiving both a TV signal and an add-on signal within the frequency band occupied by the TV signal alone, comprising: means for supplying a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add-on signal being of a selected polarity during portion of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion which is identically repeated during the remaining like line interval portion whereby said add-on signal is intentionally made redundant and of an opposite polarity during pairs of time successive line interval portions; means for combining and transmitting both said add-on and said TV signals; means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means responsive to said received combined signal for processing said signal during pairs of line interval portions to tend to cause redundant video information therein to cancel and redundant add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element for each pair of line interval portions employed.
Claim 2
Independent Claim
258 words
A system for compatibly transmitting and receiving both a TV signal and an add-on signal within the frequency band occupied by the TV signal alone, comprising: means for supplying a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add-on signal being of a selected polarity during portion of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion which is identically repeated during the remaining like line interval portion whereby said add-on signal is intentionally made redundant and of an opposite polarity during pairs of time successive line interval portions; means for combining and transmitting both said add-on and said TV signals; means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means responsive to said received combined signal for processing said signal during pairs of line interval portions to tend to cause redundant video information therein to cancel and redundant add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element for each pair of line interval portions employed.
Claim 3
Dependent Claim
119 words
Apparatus in accordance with claim 1 wherein said processing means includes means, responsive to said received combined signal, for detecting said combined signal and for inverting the polarity of the detected signal during every other line interval, to provide a detected add-on signal in which during pairs of like line interval portions each indentically repeated add-on information element has the same polarity and in which any detected redundant video information has an opposite polarity; and means, responsive to tend to said detected add-on signal for integrating the add-on signal which occurs during each of said pairs of like line interval portions thereby causing said identical add-on information elements to reinforce and said opposite polarity redundant video information to cancel.
Claim 4
Dependent Claim
120 words
Apparatus in accordance with claim 2 wherein said means for generating the add-on signal includes means for generating an add-on signal carrier having a frequency which is an odd multiple of one-half the frequency at which said time successive line intervals occur and means for modulating said add-on signal carrier with selected add-on information consisting of add-on information elements occurring during each alternate line interval portion and an identically repeated add-on information element of the same polarity occurring during a like portion of each remaining line interval; whereby the frequency of said add-on signal carrier causes the add-on information element in each pair of time successive line interval portions to have opposite polarities when said received combined signal is displayed.
Claim 5
Independent Claim
368 words
A system for compatibly transmitting and receiving both a TV signal and an add-on signal within the frequency band occupied by the TV signal alone, comprising: means for supplying a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal carrier having a frequency which is an odd multiple of one-half of the frequency at which said time successive line intervals occur; means for modulating said add-on signal carrier with selected add-on information consisting of add-on information elements occurring during portions of alternate ones of said line intervals and of identically repeated add-on information elements of the same polarity as said original information elements occurring during like portions of the remaining line intervals, to provide an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, whereby said add-on signal is intentionally made redundant and of an opposite polarity during like portions of pairs of time successive line intervals, due to the selection of said add-on signal carrier frequency and the repeating of each add-on information element; means for combining and transmitting both said add-on and said color TV signals; means for receiving and displaying said combined signal whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel in the displayed image during said pairs of line interval portions; a synchronous detector, jointly responsive to said received combined signal and to a supplied regenerated add-on signal carrier, for developing a detected add-on signal representative of said add-on information whereby the frequency of said regenerated add-on carrier causes the identically repeated add-on information elements to have the same polarity and causes any redundant video information in the detected add-on signal to have an opposite polarity; and means, responsive to said detected add-on signal, for integrating sid signal during each of said pairs of line interval portions to tend to cause redundant video information therein to cancel and identical add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element per pair of line interval portions employed.
Claim 6
Independent Claim
368 words
A system for compatibly transmitting and receiving both a TV signal and an add-on signal within the frequency band occupied by the TV signal alone, comprising: means for supplying a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal carrier having a frequency which is an odd multiple of one-half of the frequency at which said time successive line intervals occur; means for modulating said add-on signal carrier with selected add-on information consisting of add-on information elements occurring during portions of alternate ones of said line intervals and of identically repeated add-on information elements of the same polarity as said original information elements occurring during like portions of the remaining line intervals, to provide an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, whereby said add-on signal is intentionally made redundant and of an opposite polarity during like portions of pairs of time successive line intervals, due to the selection of said add-on signal carrier frequency and the repeating of each add-on information element; means for combining and transmitting both said add-on and said color TV signals; means for receiving and displaying said combined signal whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel in the displayed image during said pairs of line interval portions; a synchronous detector, jointly responsive to said received combined signal and to a supplied regenerated add-on signal carrier, for developing a detected add-on signal representative of said add-on information whereby the frequency of said regenerated add-on carrier causes the identically repeated add-on information elements to have the same polarity and causes any redundant video information in the detected add-on signal to have an opposite polarity; and means, responsive to said detected add-on signal, for integrating sid signal during each of said pairs of line interval portions to tend to cause redundant video information therein to cancel and identical add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element per pair of line interval portions employed.
Claim 7
Dependent Claim
43 words
Apparatus in accordance with claim 4 wherein each line interval is divided into at least two line interval portions, thereby providing said output signal with add-on information occurring at a rate of at least two add-on elements for each pair of line intervals.
Claim 8
Dependent Claim
59 words
Apparatus in accordance with claim 5 wherein said integrating mEans includes one integrator for each pair of line interval portions employed and switching means for activating each of said integrators only during its associated line interval portion to detect any add-on information element occurring therein, and means for combining the outputs of each integrator to provide said output signal.
Claim 9
Dependent Claim
33 words
Apparatus in accordance with claim 6 wherein said modulating means comprises a phase modulator jointly responsive to said add-on carrier signal and said selected add-on information for providing a phase modulated add-on signal.
Claim 10
Dependent Claim
219 words
A transmitter for use in a system for compatibly transmitting and receiving both a color TV signal and an add-on signal within the frequency band occupied by the color TV signal alone, comprising: means for supplying a color TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add-on signal being of a selected polarity during portions of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion, said element being identically repeated during the remaining like line interval portion, whereby said add-on signal is intentionally made redundant and of an opposite polarity during like portions of pairs of time successive line intervals; means for combining and transmitting both said add-on and said TV signals to develop a signal suitable for reception and detection in a remote receiver in which said TV signal is displayed with a minimum of interference from said add-on signal and in which said add-on signal is detected with a minimum of interference from said TV signal.
Claim 11
Dependent Claim
219 words
A transmitter for use in a system for compatibly transmitting and receiving both a color TV signal and an add-on signal within the frequency band occupied by the color TV signal alone, comprising: means for supplying a color TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add-on signal being of a selected polarity during portions of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion, said element being identically repeated during the remaining like line interval portion, whereby said add-on signal is intentionally made redundant and of an opposite polarity during like portions of pairs of time successive line intervals; means for combining and transmitting both said add-on and said TV signals to develop a signal suitable for reception and detection in a remote receiver in which said TV signal is displayed with a minimum of interference from said add-on signal and in which said add-on signal is detected with a minimum of interference from said TV signal.
Claim 12
Dependent Claim
117 words
Apparatus in accordance with claim 8 wherein said means for generating the add-on signal includes means for generating an add-on signal carrier having a frequency which is an odd multiple of one-half the frequency at which said line intervals occur and means for modulating said add-on signal carrier with selected add-on information consisting of an add-on information element occurring during each alternate line interval portion and an identically repeated add-on information element of the same polarity occurring during a like portion of each remaining line interval; whereby the frequency of said add-on signal carrier causes the add-on information element in each pair of line interval portions to have opposite polarities when said received combined signal is displayed.
Claim 13
Dependent Claim
33 words
Apparatus in accordance with claim 9 wherein said modulating means comprises a phase modulator jointly responsive to said add-on carrier signal and said selected add-on information for providing a phase modulated add-on signal.
Claim 14
Dependent Claim
196 words
A receiver for use in a system for compatibly transmitting and receiving a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals, which is combined with an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add-on signal containing intentionally redundant and opposite polarity add-on information consisting of add-on information elements occurring during portions of alternate ones of said line intervals and identically repeated and opposite polarity add-on information elements occurring during like portions of remaining line intervals, comprising: means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means, responsive to said received combIned signal for processing said signal during pairs of line interval portions to cause redundant video information therein to tend to cancel and redundant add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element per pair of line interval portions employed.
Claim 15
Dependent Claim
196 words
A receiver for use in a system for compatibly transmitting and receiving a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals, which is combined with an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add-on signal containing intentionally redundant and opposite polarity add-on information consisting of add-on information elements occurring during portions of alternate ones of said line intervals and identically repeated and opposite polarity add-on information elements occurring during like portions of remaining line intervals, comprising: means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means, responsive to said received combIned signal for processing said signal during pairs of line interval portions to cause redundant video information therein to tend to cancel and redundant add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element per pair of line interval portions employed.
Claim 16
Dependent Claim
106 words
A receiver in accordance with claim 11 wherein said processing means includes means, responsive to said received combined signal, for detecting said signal and for inverting the polarity of the detected signal during every other time successive line interval, to provide a detected signal in which during like portions of pairs of line intervals, redundant add-on information elements have the same polarity whereas any redundant video information elements are of opposite polarity; and means for integrating said detected signal during each of said pairs of like line interval portions thereby causing said redundant add-on information elements to reinforce and said redundant video information elements to cancel.
Claim 17
Dependent Claim
334 words
A receiver for use in a system for compatibly transmitting and receiving a combined TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals, and an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add on signal consisting of add-on information elements occurring during portions of alternate ones of said line intervals, and identically repeated add-on information elements of the same polarity occurring during like portions of remaining line intervals, said elements being modulated on an add-on signal carrier whose frequency is an odd multiple of one-half of the frequency at which said line intervals occur, thus providing an add-on signal which is intentionally redundant and of an opposite polarity during like portions of pairs of time successive line intervals, comprising: means for receiving and displaying said combined signal whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel in the displayed image during said pairs of line interval portions; a synchronous detector, jointly responsive to said received combined signal and to a supplied regenerated add-on signal carrier, for developing detected add-on signal representative of said add-on information whereby the use of a regenerated add-on carrier signal, whose frequency is an odd multiple of one-half of the frequency at which said line intervals occur causes, during said pairs of line interval portions, the identically repeated add-on information elements to have the same polarity and causes redundant video information contained in the detected add-on signal to have an opposite polarity; and means, responsive to said detected add-on signal, for integrating the add-on signal which occurs during each of said pairs of line interval portions to tend to cause redundant video information therein to cancel and identical add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element for each pair of line interval portions employed.
Claim 18
Dependent Claim
334 words
A receiver for use in a system for compatibly transmitting and receiving a combined TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals, and an add-on signal located within a portion of said frequency band lying between the normal location of the luminance and chrominance carrier frequencies, said add on signal consisting of add-on information elements occurring during portions of alternate ones of said line intervals, and identically repeated add-on information elements of the same polarity occurring during like portions of remaining line intervals, said elements being modulated on an add-on signal carrier whose frequency is an odd multiple of one-half of the frequency at which said line intervals occur, thus providing an add-on signal which is intentionally redundant and of an opposite polarity during like portions of pairs of time successive line intervals, comprising: means for receiving and displaying said combined signal whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel in the displayed image during said pairs of line interval portions; a synchronous detector, jointly responsive to said received combined signal and to a supplied regenerated add-on signal carrier, for developing detected add-on signal representative of said add-on information whereby the use of a regenerated add-on carrier signal, whose frequency is an odd multiple of one-half of the frequency at which said line intervals occur causes, during said pairs of line interval portions, the identically repeated add-on information elements to have the same polarity and causes redundant video information contained in the detected add-on signal to have an opposite polarity; and means, responsive to said detected add-on signal, for integrating the add-on signal which occurs during each of said pairs of line interval portions to tend to cause redundant video information therein to cancel and identical add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element for each pair of line interval portions employed.
Claim 19
Dependent Claim
40 words
Apparatus in accordance with claim 13 wherein there are at least two line interval portions for each line interval, thereby providing said output signal with add-on information occurring at a rate of at least two add-on elements per line interval.
Claim 20
Dependent Claim
61 words
Apparatus in accordance with claim 14 wherein said integrating means includes one integrator for each pair of time successive line interval portions employed and switching means for activating each of said integrators only during its associated line interval portion to detect any add-on information element occurring therein, and means for combining the outputs of each integrator to providE said output signal.
Claim 21
Independent Claim
246 words
A system for compatibly transmitting and receiving both a TV signal and an add-on signal within the frequency band occupied by the TV signal alone, comprising: means for supplying a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band, said add-on signal being of a selected polarity during portion of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion which is identically repeated during the remaining like line interval portion whereby said add-on signal is intentionally made redundant and of an opposite polarity during pairs of time successive line interval portions; means for combining and transmitting both said add-on and said TV signals; means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means responsive to said received combined signal for processing said signal during pairs of line interval portions to cause redundant video information therein to tend to cancel and redundant add-on information elements therein to reinforce thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element for each pair of line interval portions employed.
Claim 22
Independent Claim
246 words
A system for compatibly transmitting and receiving both a TV signal and an add-on signal within the frequency band occupied by the TV signal alone, comprising: means for supplying a TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band, said add-on signal being of a selected polarity during portion of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion which is identically repeated during the remaining like line interval portion whereby said add-on signal is intentionally made redundant and of an opposite polarity during pairs of time successive line interval portions; means for combining and transmitting both said add-on and said TV signals; means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means responsive to said received combined signal for processing said signal during pairs of line interval portions to cause redundant video information therein to tend to cancel and redundant add-on information elements therein to reinforce thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element for each pair of line interval portions employed.
Claim 23
Dependent Claim
119 words
Apparatus in accordance with claim 16 wherein said processing means includes means, responsive to said received combined signal, for detecting said combined signal and for inverting the polarity of the detected signal during every other line interval, to provide a detected add-on signal in which during pairs of like line interval portions each identically repeated add-on information element has the same polarity and in which any detected redundant video information has an opposite polarity; and means, responsive to said detected add-on signal for integrating the add-on signal which occurs during each of said pairs of like line interval portions thereby causing said identical add-on information elements to reinforce and said opposite polarity redundant video information to tend to cancel.
Claim 24
Dependent Claim
207 words
A transmitter for use in a system for compatibly transmitting and receiving both a color TV signal and an add-on signal within the frequency band occupied by the color TV signal alone, comprising: means for supplying a color TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band, said add-on signal being of a selected polarity during portions of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion, said element being identically repeated during the remaining like line interval portion, whereby said add-on signal is intentionally made redundant and of an opposite polarity during like portions of pairs of time successive line intervals; means for combining and transmitting both said add-on and said TV signals to develop a signal suitable for reception and detection in a remote receiver in which said TV signal is displayed with a minimum of interference from said add-on signal and in which said add-on signal is detected with a minimum of interference from said TV signal.
Claim 25
Dependent Claim
207 words
A transmitter for use in a system for compatibly transmitting and receiving both a color TV signal and an add-on signal within the frequency band occupied by the color TV signal alone, comprising: means for supplying a color TV signal occupying a predetermined frequency band and containing video information occurring during time successive line intervals; means for generating an add-on signal located within a portion of said frequency band, said add-on signal being of a selected polarity during portions of alternate ones of said line intervals and of an opposite polarity during like portions of remaining line intervals, and said add-on signal containing one element of add-on information for each alternate line interval portion, said element being identically repeated during the remaining like line interval portion, whereby said add-on signal is intentionally made redundant and of an opposite polarity during like portions of pairs of time successive line intervals; means for combining and transmitting both said add-on and said TV signals to develop a signal suitable for reception and detection in a remote receiver in which said TV signal is displayed with a minimum of interference from said add-on signal and in which said add-on signal is detected with a minimum of interference from said TV signal.
Claim 26
Dependent Claim
184 words
A receiver for use in a system for compatibly transmitting and receiving a TV signal occupying a predetermined frequency band and containing video information occurrinG during time successive line intervals, which is combined with an add-on signal located within a portion of said frequency band, said add-on signal containing intentionally redundant and opposite polarity add-on information consisting of add-on information elements occurring during portions of alternate ones of said line intervals and identically repeated and opposite polarity add-on information elements occurring during like portions of remaining line intervals, comprising: means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means, responsive to said received combined signal for processing said signal during pairs of line interval portions to cause redundant video information therein to tend to cancel and redundant add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element per pair of line interval portions employed.
Claim 27
Dependent Claim
184 words
A receiver for use in a system for compatibly transmitting and receiving a TV signal occupying a predetermined frequency band and containing video information occurrinG during time successive line intervals, which is combined with an add-on signal located within a portion of said frequency band, said add-on signal containing intentionally redundant and opposite polarity add-on information consisting of add-on information elements occurring during portions of alternate ones of said line intervals and identically repeated and opposite polarity add-on information elements occurring during like portions of remaining line intervals, comprising: means for receiving said combined signal, whereby the intentionally redundant and opposite polarity add-on information tends to visually cancel during said pairs of line interval portions when said combined signal is displayed; and means, responsive to said received combined signal for processing said signal during pairs of line interval portions to cause redundant video information therein to tend to cancel and redundant add-on information elements therein to reinforce, thereby developing an output signal primarily representative of said add-on information and occurring at a rate of one add-on element per pair of line interval portions employed.
Claim 28
Dependent Claim
108 words
A receiver in accordance with claim 19 wherein said processing means includes means, responsive to said received combined signal, for detecting said signal and for inverting the polarity of the detected signal during every other time successive line interval, to provide a detected signal in which during like portions of pairs of line intervals, redundant add-on information elements have the same polarity whereas any redundant video information elements are of opposite polarity; and means for integrating said detected signal during each of said pairs of like line interval portions thereby causing said redundant add-on information elements to reinforce and said redundant video information elements to tend to cancel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |