US3280260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic signal transmission and reception system
Assignee: Lanteris Space LLC
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Filing: 1959-02-09
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Granted: 1966-10-18
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Expires: 1979-02-09
Abstract
No abstract record available.
Inventors
- 👤 Wilson P Boothroyd
- 👤 Jr Edgar M Creamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/44; H04H20/46; H04H20/47; H04H20/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A TRANSMITTER FOR A STEREO FM TRANSMISSION SYSTEM COMPRISING: MEANS FOR DEVELOPING FIRST AND SECOND AUDIO SIGNALS A AND B; A SIGNAL GENERATOR FOR GENERATING A SIGNAL S HAVING A FUNDAMENTAL FREQUENCY SUBSTANTIALLY HIGHER THAN THE HIGHEST AUDIO FREQUENCY TO BE TRANSMITTED; MEANS FOR EFFECTIVELY MULTIPLYING SAID AUDIO SIGNALS WITH SAID SIGNAL S TO DEVELOP A SUPPRESSED-CARRIER AMPLITUDE-MODULATED SUBCARRIER SIGNAL, THE FREQUENCY OF SAID SUBCARRIER BEING EQUAL TO THE FREQUENCY OF SAID SIGNAL S, SAID SIGNAL GENERATOR INCLUDING MEANS FOR DEVELOPING A PHASE REFERENCE SIGNAL HAVING A PHASE AND FREQUENCY REPRESENTATIVE OF THE PHASE AND FREQUENCY OF SAID SUBCARRIER SIGNAL, AND TRANSMISSION MEANS INCLUD-
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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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |