US3176226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elimination of frequency shift in suppressed carrier systems
Assignee: AT&T Inc
•
Filing: 1961-11-28
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Granted: 1965-03-30
•
Expires: 1981-11-28
Abstract
No abstract record available.
Inventors
- 👤 Uriah S Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:05
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A SUPPRESSED-CARRIER AMPLITUDE MODULATION SIGNAL TRANSMISSION SYSTEM HAVING A TRAINING END A RECEIVING END, AN ARRANGEMENT FOR ELIMINATING FRQUENY ERROR WHICH COMPRISES MEANS TO TRANSMIT A PAIR OF PILOT FREQUENCIES OVER SAID SYSTEM ALONG WITH THE REGULAR SIGNAL FROM THE TRANSMITTING END OF THE RECEIVING END, SAID PILOT FREQUENCIES BEING HARMONICALLY RELATED TO ONE ANOTHER, A DEMODULATOR AT THE RECEIVING END OF SAID SYSTEM, MEANS TO SELECT SAID PILOT FREQUENCIES AT THE RECEIVING END OF SAID SYSTEM, MEANS TO MULTIPLY ONE OF SAID PILOT FRE-
Claim 2
Dependent Claim
86 words
IN A SUPPRESSED-CARRIER AMPLITUDE MODULATION SIGNAL TRANSMISSION SYSTEM HAVING A TRAINING END A RECEIVING END, AN ARRANGEMENT FOR ELIMINATING FRQUENY ERROR WHICH COMPRISES MEANS TO TRANSMIT A PAIR OF PILOT FREQUENCIES OVER SAID SYSTEM ALONG WITH THE REGULAR SIGNAL FROM THE TRANSMITTING END OF THE RECEIVING END, SAID PILOT FREQUENCIES BEING HARMONICALLY RELATED TO ONE ANOTHER, A DEMODULATOR AT THE RECEIVING END OF SAID SYSTEM, MEANS TO SELECT SAID PILOT FREQUENCIES AT THE RECEIVING END OF SAID SYSTEM, MEANS TO MULTIPLY ONE OF SAID PILOT FRE-
References Cited (Backward Citations)
US2778877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |