US4075659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic door announcer
Assignee: Individual
•
Filing: 1975-09-25
•
Granted: 1978-02-21
•
Expires: 1995-09-25
Abstract
Abstract Electronic door announcer for apartments of a multi-family dwelling having a community television antenna in which the signals due to sound and video operation of the announcer are carried by at least part of the community antenna coaxial cable system, switching means for the individual apartments being connected into said coaxial cable system.
Inventors
- 👤 Etiennette Romani Desanti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:24
CPC Classifications
G; G08; G08B; G08B27/00; G08B27/008; H; H04; H04M; H04M11/00; H04M11/02; H04M11/025; H04N; H04N7/00; H04N7/10; H04N7/106; H04N7/18; H04N7/183; H04N7/186
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
268 words
In an electronic door announcer system for multiple unit buildings including a main door announcer unit and at least one individual building unit announcer unit and a master antenna system having a coaxial cable network comprised of at least one coaxial trunk line and at least one coaxial branch line coupled to said trunk line for utilizing said coaxial cable network as the signal transmission means for said door announcer system, said branch line being fed to a building unit including said at least one announcer unit, the improvement comprising: circuit means including a high frequency modulator, adapted to modulate signals originating in said main door announcer unit, coupled to said trunk line in the region of said door announcer unit for transmitting modulated signals to said building unit via said branch line; first and second bidirectional signal coupler means for audio frequency signals originating at said main door announcer unit and said building unit announcer unit, respectively, coupled to said branch line, said first coupler unit being located at the trunk line end of the branch line and said second coupler means being located at the building unit end of the branch line; audio signal transmission line means between said first coupler means and said main door announcer unit; circuit means coupling audio signals between said second coupler means and said building unit announcer unit; and circuit means, responsive to said modulated signals from said modulator, coupled between said branch line and said building unit announcer unit for providing signals, utilizable by said building unit announcer unit, corresponding to signals originating at said main door announcer unit.
Claim 2
Dependent Claim
268 words
In an electronic door announcer system for multiple unit buildings including a main door announcer unit and at least one individual building unit announcer unit and a master antenna system having a coaxial cable network comprised of at least one coaxial trunk line and at least one coaxial branch line coupled to said trunk line for utilizing said coaxial cable network as the signal transmission means for said door announcer system, said branch line being fed to a building unit including said at least one announcer unit, the improvement comprising: circuit means including a high frequency modulator, adapted to modulate signals originating in said main door announcer unit, coupled to said trunk line in the region of said door announcer unit for transmitting modulated signals to said building unit via said branch line; first and second bidirectional signal coupler means for audio frequency signals originating at said main door announcer unit and said building unit announcer unit, respectively, coupled to said branch line, said first coupler unit being located at the trunk line end of the branch line and said second coupler means being located at the building unit end of the branch line; audio signal transmission line means between said first coupler means and said main door announcer unit; circuit means coupling audio signals between said second coupler means and said building unit announcer unit; and circuit means, responsive to said modulated signals from said modulator, coupled between said branch line and said building unit announcer unit for providing signals, utilizable by said building unit announcer unit, corresponding to signals originating at said main door announcer unit.
Claim 3
Dependent Claim
48 words
The system as defined by claim 1 and additionally including a main door lock and relay means adapted to release said main door lock and wherein said building unit announcer unit includes means for generating a control signal coupled to said branch line for selectively operating said relay.
Claim 4
Dependent Claim
51 words
The system as defined by claim 2 wherein said means for generating said control signal for operating said relay includes a high frequency signal source and additionally including means coupled to said relay which is responsive to high frequency signals coupled thereto from said high frequency source to operate said relay.
Claim 5
Dependent Claim
59 words
The system as defined by claim 1 wherein said main door announcer unit additionally includes television camera means coupled to said modulator means for coupling video signals thereto and wherein said building unit announcer unit includes television receiver means coupled to said circuit means responsive to said modulated signals from said modulator for receiving signals from television camera means.
Claim 6
Dependent Claim
29 words
The system as defined by claim 4 wherein said main door announcer unit includes selectively actuated audio signal generator means for transmitting an annunciator signal to said branch line.
Claim 7
Dependent Claim
19 words
The system as defined by claim 5 wherein said audio signal generator is coupled to said first coupler means.
Claim 8
Dependent Claim
37 words
The system as defined by claim 6 and additionally including circuit means coupled to said branch line at said individual building unit and being operable in response to said annunciator signal to turn on said television receiver.
Claim 9
Dependent Claim
34 words
The system as defined by claim 1 wherein said circuit means responsive to said modulated signals includes a high frequency signal demodulator for demodulating high frequency signals received from said main door announcer unit.
Claim 10
Dependent Claim
38 words
The system as defined by claim 8 wherein said main door announcer unit additionally includes a television camera coupled to said modulator unit and wherein said building unit announcer unit includes television receiver means coupled to said demodulator.
Claim 11
Dependent Claim
55 words
The system as defined by claim 9 wherein said main door announcer unit includes pushbutton operated audio signal generator means selectively coupled to said branch line and additionally including circuit means responsive to a signal received from said audio signal generator means for turning on said television receiver and for rendering said demodulator unit operable.
Claim 12
Dependent Claim
85 words
The system as defined by claim 1 and additionally comprising circuit means including a high frequency modulator, coupled to and adapted to modulate signals originating in said building unit announcer unit, coupled to said branch line for transmitting modulated signals to said main door unit, and circuit means at said main door announcer unit, responsive to modulated signals from said last recited high frequency modulator for providing signals utilizable by said main door announcer unit, corresponding to signals originating at said building unit announcer unit.
Claim 13
Dependent Claim
22 words
The system as defined by claim 11 wherein both said means responsive to said modulated signals are comprised of high frequency demodulators.
Claim 14
Dependent Claim
69 words
The system as defined by claim 12 and additionally including a main door lock and relay means operable to release said main door lock and wherein said building unit announcer unit includes means for selectively providing a control coupled to the high frequency modulator coupled to said building unit announcer unit and wherein said relay means is coupled to the high frequency demodulator at said main door announcer unit.
Claim 15
Dependent Claim
130 words
The system as defined by claim 1 wherein said coaxial cable network is comprised of a plurality of coaxial trunk lines respectively isolated from each other and wherein each of said trunk lines has a plurality of branch lines respectively coupled thereto, each said branch lines including respective first and second bidirectional couplers coupled thereto with said first bidirectional coupler means connected back to said main door announcer unit and a respective high frequency modulator coupled to each said trunk line and respective television camera means coupled to each high frequency modulator and wherein each of said plurality of branch lines coupled to respective building unit announcer units including a television receiver selectively responsive to said TV camera coupled to the trunk line to which the branch line is connected.
Claim 16
Dependent Claim
35 words
The system as defined by claim 1 wherein said main door announcer unit is remotely located from said trunk line and coupled thereto by means of a radio link coupled to said coaxial cable network.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |