US3573378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone call timing circuit
Assignee: Bell Telephone Company of Canada
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Filing: 1968-04-11
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Granted: 1971-04-06
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Expires: 1988-04-11
Abstract
Abstract A timing circuit which includes a pulse generator for generating a train of timed pulses for the duration of a data call on a telephone line. A first counting circuit repeatedly counts a predetermined number of pulses and generates an output pulse at the end of each group of pulses. A second counting circuit counts a predetermined number of output pulses from the first counting circuit and generates a further output pulse which operates a relay to energize an overtime register and disable the second counting circuit. The overtime register subsequently registers every time the first pulse of a group of pulses is counted.
Inventors
- 👤 Derek Leyburn
- 👤 James S Kyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:01
CPC Classifications
H; H04; H04M; H04M15/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A timing circuit for measuring the duration of a call on a telephone line comprising: a. an overtime register; b. pulse generating means responsive to the initiation of a call for generating timed pulses for at least the duration of said call; c. first counting means for repeatedly counting a predetermined number of said pulses, each of said predetermined number of pulses forming a group of pulses, said counting means producing an output pulse each time a group of pulses has been counted; d. second counting means responsive to the output pulses from said first counting means for producing an output pulse when a predetermined number of said groups of pulses has been counted; e. means responsive to the output pulse of said second counting means for conditioning the overtime register and for disabling said second counting means; and f. means for enabling the conditioned overtime register thereafter in response to the first pulse of each succeeding group of pulses for the duration of the call.
Claim 2
Dependent Claim
166 words
A timing circuit for measuring the duration of a call on a telephone line comprising: a. an overtime register; b. pulse generating means responsive to the initiation of a call for generating timed pulses for at least the duration of said call; c. first counting means for repeatedly counting a predetermined number of said pulses, each of said predetermined number of pulses forming a group of pulses, said counting means producing an output pulse each time a group of pulses has been counted; d. second counting means responsive to the output pulses from said first counting means for producing an output pulse when a predetermined number of said groups of pulses has been counted; e. means responsive to the output pulse of said second counting means for conditioning the overtime register and for disabling said second counting means; and f. means for enabling the conditioned overtime register thereafter in response to the first pulse of each succeeding group of pulses for the duration of the call.
Claim 3
Dependent Claim
51 words
A timing circuit as defined in claim 1 wherein said first counting means comprises a first flip-flop circuit responsive to said timed pulses, and first pulse counting relays responsive to said first flip-flop circuit for counting said predetermined number of pulses and producing said output pulses from said first counting means.
Claim 4
Dependent Claim
57 words
A timing circuit as defined in claim 2 wherein said second counting means comprises a second flip-flop circuit responsive to the output pulses from said first counting means, and second pulse counting relays responsive to said second flip-flop circuit for counting predetermined number of groups of pulses and producing said output pulse from said second counting means.
Claim 5
Dependent Claim
24 words
A timing circuit as defined in claim 3 wherein said means responsive to the output pulse of the second counting means is a relay.
Claim 6
Dependent Claim
16 words
A timing circuit as defined in claim 4 wherein said relay disables the second flip-flop circuit.
Claim 7
Dependent Claim
27 words
A timing circuit as defined in claim 5 wherein said means for enabling the conditioned overtime register comprises a predetermined relay of said first pulse counting relays.
References Cited (Backward Citations)
US2404654A
Cited
US2488797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |