US3305646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo suppressor with improved break-in circuitry
Assignee: AT&T Inc
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Filing: 1963-11-13
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Granted: 1967-02-21
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Expires: 1983-11-13
Abstract
No abstract record available.
Inventors
- 👤 Paul T Brady
- 👤 George K Helder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:04
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
IN A COMMUNICATION SYSTEM, FIRST AND SECOND TERMINALS, A TWO-WAY LOCAL CIRCUIT ASSOCIATED WITH EACH OF SAID TERMINALS, FIRST AND SECOND TRANSMISSION CIRCUITS, MEANS INTERCONNECTING SAID TRANSMISSION AND THE LOCAL CIRCUITS AT SAID TERMINALS TO PERMIT TWO-WAY TRANSMISSION BETWEEN SAID LOCAL CIRCUITS AND MEANS FOR SUPPRESSING ECHOES IN SAID TRANSMISSION DESPITE EXTENDED DELAY IN SAID TRANSMISSION CIRCUITS COMPRISING AT EAHC TERMINAL MEANS FOR DETECTING INCOMING SPEECH SIGNALS AND EFFECTIVELY BLOCKING THE TRANSMISSION CIRCUIT TO THE OTHER OF SAID TERMINALS, MEANS FOR DETECTING DOUBLE TALKING, A COMPRESSOR, MEANS RESPONSIVE TO SAID DOUBLE TALKING DETECTOR MEANS FOR REESTABLISHING THE TRANSMISSION PATH TO THE OTHER OF SAID TERMINALS AND FOR INSERTING SAID COMPRESSOR IN THE INCOMING PATH TO THAT TERMINAL.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |