US3206559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo suppressor for circuit with long delay
Assignee: AT&T Inc
•
Filing: 1961-04-11
•
Granted: 1965-09-14
•
Expires: 1981-04-11
Abstract
No abstract record available.
Inventors
- 👤 Sara E Barney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:11
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/005; H04B3/00; H04B3/02; H04B3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN A TWO-WAY TELEPHONE CIRCUIT OF LONG AND VARIABLE PATH LENGTH, AN ECHO SUPPRESSOR IN CIRCUIT CONNECTION WITH SAID TELEPHONE CIRCUIT, MEANS FOR CONTINUOUSLY DETERMINING THE MOMENTARY TRANSMISSION DELAY OF SAID CIRCUIT AS IT CHANGES FROM MOMENT TO MOMENT DURING TRANSMISSION THEREOVER, AND MEANS RESPONSIVE TO SAID MOMENTARY TRANSMISSION DELAY FOR COORDINATING THE PERIOD OF OPERATION OF SAID ECHO SUPPRESSOR MOMENTLY WITH THE TIME OF PROBABLE ECHO RETURN.
Claim 2
Dependent Claim
68 words
IN A TWO-WAY TELEPHONE CIRCUIT OF LONG AND VARIABLE PATH LENGTH, AN ECHO SUPPRESSOR IN CIRCUIT CONNECTION WITH SAID TELEPHONE CIRCUIT, MEANS FOR CONTINUOUSLY DETERMINING THE MOMENTARY TRANSMISSION DELAY OF SAID CIRCUIT AS IT CHANGES FROM MOMENT TO MOMENT DURING TRANSMISSION THEREOVER, AND MEANS RESPONSIVE TO SAID MOMENTARY TRANSMISSION DELAY FOR COORDINATING THE PERIOD OF OPERATION OF SAID ECHO SUPPRESSOR MOMENTLY WITH THE TIME OF PROBABLE ECHO RETURN.
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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |