US3280274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo suppressor for communication systems having extended transmission delays
Assignee: AT&T Inc
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Filing: 1963-10-30
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Granted: 1966-10-18
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Expires: 1983-10-30
Abstract
No abstract record available.
Inventors
- 👤 Max S Schoeffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:43
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN A COMMUNICATION SYSTEM HAVING FIRST AND SECOND TERMINALS EACH INCLUDING A TWO-WIRE TERMINAL BRANCH AND TWO ONE-WAY TRANSMISSION BRANCHES INTERCONNECTING SAID TERMINALS TO PROVIDE TWO-WAY COMMUNICATION BETWEEN SAID TERMINAL BRANCHES, ECHO SUPPRESSION MEANS ARRANGED TO PERMIT COMMUNICATION BETWEEN SAID TERMINAL BRANCHES DESPITE EXTENDED TRANSMISSION DELAYS COMPRISING A SPLIT TERMINAL ECHO SUPPRESSOR, MEANS AT EACH TERMINAL FOR DETECTING THE INITIATION OF SPEECH SIGNALS AT THAT TERMINAL WHILE SPEECH SIGNALS ARE BEING RECEIVED AT THAT TERMINAL FROM THE OTHER TERMINAL, AND MEANS RESPONSIVE TO THE DETECTION OF THIS CONDITION FOR SUBSTANTIALLY INCREASING THE LEVEL OF THE SIGNALS RECEIVED FROM THE OTHER TERMINAL.
Claim 2
Dependent Claim
101 words
IN A COMMUNICATION SYSTEM HAVING FIRST AND SECOND TERMINALS EACH INCLUDING A TWO-WIRE TERMINAL BRANCH AND TWO ONE-WAY TRANSMISSION BRANCHES INTERCONNECTING SAID TERMINALS TO PROVIDE TWO-WAY COMMUNICATION BETWEEN SAID TERMINAL BRANCHES, ECHO SUPPRESSION MEANS ARRANGED TO PERMIT COMMUNICATION BETWEEN SAID TERMINAL BRANCHES DESPITE EXTENDED TRANSMISSION DELAYS COMPRISING A SPLIT TERMINAL ECHO SUPPRESSOR, MEANS AT EACH TERMINAL FOR DETECTING THE INITIATION OF SPEECH SIGNALS AT THAT TERMINAL WHILE SPEECH SIGNALS ARE BEING RECEIVED AT THAT TERMINAL FROM THE OTHER TERMINAL, AND MEANS RESPONSIVE TO THE DETECTION OF THIS CONDITION FOR SUBSTANTIALLY INCREASING THE LEVEL OF THE SIGNALS RECEIVED FROM THE OTHER 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) | 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 |