US3214526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo suppressor with improved break-in
Assignee: AT&T Inc
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Filing: 1961-12-29
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Granted: 1965-10-26
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Doren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:39
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
IN A TRANSMISSION SYSTEM INCLUDING AT LEAST TWO TERMINALS INTERCONNECTED BY TRANSMITTING AND RECEIVING PATHS, AN ECHO SUPPRESSOR AT EACH TERMINAL COMPRISING, IN COMBINATION, FIRST MEANS FOR COMPARING THE LEVEL OF SIGNALS IN SAID PATH AND FOR PRODUCING AN OUTPUT SIGNAL REPRESENTATIVE OF THEIR DIFFERENCE AND MEANS RESPONSIVE TO SAID OUTPUT SIGNAL FOR ATTENUATING SIGNALS IN SAID TRANSMITTING PATH, SECOND MEANS FOR COMPARING THE VARIPRODUCING AN OUTPUT WHEN THE SIGNALS IN SAID PATHS DO NOT VARY SIMULTANEOUSLY, DISABLING MEANS FOR DISABLING SAID ECHO SUPPRESSOR, SLOW-RELEASE MEANS RESPONSIVE TO THE PRESENCE OF AN OUTPUT FROM SAID SECOND MEANS FOR OPERATING SAID DISABLING MEANS AND FOR MAINTAINING SAID DISABLING MEANS OPERATED FOR A PREDETERMINED INTERVAL OF TIME AFTER THE OUTPUT FROM SAID SECOND MEANS DISAPPEARS, AND MEANS RESPONSIVE TO THE RECEPTION OF A PREDETERMINED LEVEL OF OUTPUT SIGNAL FROM SAID FIRST MEANS FOR RENDERING SAID SLOW-RELEASE MEANS INOPERATIVE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |