Patent US4473067A successfully refreshed from Google Patents.
US3231818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio secrecy system for subscription television
Assignee: Paramount Pictures Corp
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Filing: 1961-11-09
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Granted: 1966-01-25
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Expires: 1981-11-09
Abstract
No abstract record available.
Inventors
- 👤 Patrick R J Court
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:05
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
IN A TELEVISION SYSTEM OF THE TYPE WHEREIN THERE ARE TRANSMITTED FIRST AND SECOND FREQUENCY-MODULATED CARRIERS, SAID FIRST FREQUENCY-MODULATED CARRIER BEING FREQUENCY MODULATED BY SAID FIRST AND SECOND SIGNALS, SAID SECOND FREQUENCY-MODULATED CARRIER BEING FREQUENCY MODULATED BY SAID SECOND SIGNALS, A RECEIVER HAVING MEANS FOR RECEIVING SAID FREQUENCY-MODULATED FIRST AND SECOND CARRIERS, MEANS FOR COMBINING SAID FIRST CARRIER MODULATED BY SAID FIRST AND SECOND SIGNALS WITH SAID SECOND CARRIER FREQUENCY MODULATED BY SAID SECOND SIGNALS TO PROVIDE A RESULTANT CARRIER FREQUENCY MODULATED BY SAID FIRST SIGNALS, MEANS FOR SELECTING FOR OUTPUT FROM SAID RECEIVER EITHER SAID RESULTANT CARRIER FREQUENCY MODULATED BY SAID FIRST SIGNALS OR SAID SECOND CARRIER FREQUENCY MODULATED BY SAID SECOND SIGNALS, AND MEANS FOR ATTENUATING SAID SECOND SIGNALS FREQUENCY MODULATED ON A SECOND CARRIER WHEN SAID RESULTANT CARRIER FREQUENCY MODULATED BY SAID FIRST SIGNALS IS SELECTED.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |