US3240878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic communication system
Assignee: General Electric Co
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Filing: 1961-11-06
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Granted: 1966-03-15
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Expires: 1981-11-06
Abstract
No abstract record available.
Inventors
- 👤 Robert B Dome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:00
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A TRANSMITTER COMPRISING: A SOURCE OF AN INTELLIGENCE SIGNAL WHICH IS TO BE TRANSMITTED, SAID INTELLIGENCE SIGNAL HAVING AN AVERAGE VALUE OF VOLTAGE WITH POSITIVE AND NEGATIVE ALTERNATIONS ABOUT SAID AVERAGE VALUE OF VOLTAGE, MEANS PROVIDING FIRST AND SECOND SUBCARRIER SIGNALS, MEANS FOR AMPLITUDE MODULATING SAID FIRST AND SECOND SUBCARRIER SIGNAL AND SAID POSITIVE AND NEGATIVE ALTERNATIONS RESPECTIVELY, SAID MODULATION MEANS ARRANGED FOR PROVIDING OUTPUT SIGNALS OF SUBCARRIER FREQUENCY UPON OCCURENCE OF SAID INTELLIGENCE SIGNAL, AND MEANS FOR ATTENUATING HARMONIC SIDEBAND OVERLAP, GENERATED BY SAID MODULATION MEANS.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |