Patent US4477800A successfully refreshed from Google Patents.
US4477800A
Expired / Lapsed
US
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Security system
Assignee: Arris Technology Inc
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Filing: 1981-12-07
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Granted: 1984-10-16
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Expires: 2001-12-07
Abstract
Abstract A cable TV security system utilizes three radio frequency signals as three data communication channels. One downstream channel is provided as a polling channel in available spectrum space in the standard FM band. Two upstream channels are provided in the return portion of the cable spectrum. One of the upstream channels is a polling response channel, and the other is an alarm channel. Subscriber security units transmit on the polling return channel in response to downstream command messages on the polling channel. Alarm conditions are immediately transmitted on the alarm channel so that system response to an alarm condition is fast and substantially independent of the number of subscribers.
Inventors
- 👤 Thomas E. O'Brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:15
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/014; G08B25/007; G08B25/08; G08B26/00; G08B26/001; G08B26/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A subscriber security apparatus for use in a cable communication system having a headend alarm processor for providing polling messages modulating a first radio frequency signal propogating over said cable communication system from said headend alarm processor, said cable communication system also propogating second and third radio frequency signals to said headend alarm processor, said security apparatus comprising: means responsive to said polling messages modulating said first radio frequency signal for providing polling return messages modulating said second radio frequency signal; and means responsive to an alarm condition for providing an alarm message essentially when said alarm condition is first detected, said alarm message modulating said third radio frequency signal.
Claim 2
Dependent Claim
110 words
A subscriber security apparatus for use in a cable communication system having a headend alarm processor for providing polling messages modulating a first radio frequency signal propogating over said cable communication system from said headend alarm processor, said cable communication system also propogating second and third radio frequency signals to said headend alarm processor, said security apparatus comprising: means responsive to said polling messages modulating said first radio frequency signal for providing polling return messages modulating said second radio frequency signal; and means responsive to an alarm condition for providing an alarm message essentially when said alarm condition is first detected, said alarm message modulating said third radio frequency signal.
Claim 3
Dependent Claim
145 words
An alarm system comprising: a headend alarm processor including means for providing polling messages modulating a first radio frequency signal; a two way cable TV communication system for propogating said first radio frequency signal in a direction from said headend alarm processor, and for propogating second and third radio frequency signals to said headend alarm processor; and a plurality of subscriber alarm processors, each comprising means responsive to said polling messages modulating said first radio frequency signal received from said headend alarm processor over said cable system for providing respective reply messages modulating said second radio frequency signal to said headend alarm processor over said cable system, and means responsive to an alarm condition for providing an alarm message essentially when said alarm condition is first detected, said alarm message modulating said third radio frequency signal to said headend alarm processor over said cable system.
Claim 4
Dependent Claim
145 words
An alarm system comprising: a headend alarm processor including means for providing polling messages modulating a first radio frequency signal; a two way cable TV communication system for propogating said first radio frequency signal in a direction from said headend alarm processor, and for propogating second and third radio frequency signals to said headend alarm processor; and a plurality of subscriber alarm processors, each comprising means responsive to said polling messages modulating said first radio frequency signal received from said headend alarm processor over said cable system for providing respective reply messages modulating said second radio frequency signal to said headend alarm processor over said cable system, and means responsive to an alarm condition for providing an alarm message essentially when said alarm condition is first detected, said alarm message modulating said third radio frequency signal to said headend alarm processor over said cable system.
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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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |