US4439784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power cutting device for terminal units of CATV system
Assignee: Pioneer Corp
•
Filing: 1980-09-26
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Granted: 1984-03-27
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Expires: 2000-09-26
Abstract
Abstract In a CATV system, power supplies of television sets associated with all terminal units are cut in response to an instruction contained in a down-data signal supplied by a central facility of the system. It is possible to cut the power supplies of the television sets, selectively and periodically, by incorporating address informations in the down-data signal.
Inventors
- 👤 Hajime Furukawa
- 👤 Yoshitsugu Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:40
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/173; H04N7/17345; H04N7/17363
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
In a CATV system in which a central facility is connected through cables to a plurality of terminal units so that various television programs are transmitted from the central facility through the cables to the terminal units, said television sets being supplied with power from a power supply, the improvement comprising a system for shutting off power to selected terminal units to insure that the selected terminal units can not be used, said system comprising: a down-data transmitter provided in said central facility for periodically sending a down-data signal containing at least a power cutting instruction and an address number of said terminal unit, a down-data receiver provided in each of said terminal units for receiving said down-data signal and a power cutting device provided in each of said terminal units, said power cutting device being responsive to said data received by said down-data receiver to cut the power supply to said television sets when the address information contained in said down-data signal is coincident with its own address.
Claim 2
Dependent Claim
169 words
In a CATV system in which a central facility is connected through cables to a plurality of terminal units so that various television programs are transmitted from the central facility through the cables to the terminal units, said television sets being supplied with power from a power supply, the improvement comprising a system for shutting off power to selected terminal units to insure that the selected terminal units can not be used, said system comprising: a down-data transmitter provided in said central facility for periodically sending a down-data signal containing at least a power cutting instruction and an address number of said terminal unit, a down-data receiver provided in each of said terminal units for receiving said down-data signal and a power cutting device provided in each of said terminal units, said power cutting device being responsive to said data received by said down-data receiver to cut the power supply to said television sets when the address information contained in said down-data signal is coincident with its own address.
Claim 3
Dependent Claim
43 words
A system as claimed in claim 1 wherein said power switching means at each terminal comprises a power relay interposed between said power supply and said television set, and means responsive to receipt of said power cutting instruction for operating said power relay.
Claim 4
Dependent Claim
38 words
A system as claimed in claim 1 further comprising means at said central facility for periodically transmitting said down-data signal with said power cutting instruction and selected address numbers for periodically sending power disconnect instructions to selected terminals.
References Cited (Backward Citations)
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Cited
US3761914A
Cited
US3993955A
Cited
US4118669A
Cited
US4142156A
Cited
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Cited
US4367455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |