Patent US2933185A successfully refreshed from Google Patents.
Patent US3119964A successfully refreshed from Google Patents.
US3119964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shift keying communication system including automatic phase correction means
Assignee: Robertshaw Controls Co
•
Filing: 1958-08-14
•
Granted: 1964-01-28
•
Expires: 1978-08-14
Abstract
No abstract record available.
Inventors
- 👤 Cecil A Crafts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:25
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2275; H04L27/2276
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN A METHOD OF TRANSFERRING INFORMATION BY MEANS OF A PHASE MODULATED CARRIER WAVE, THE STEPS WHICH INCLUDE RECEIVING SAID MODULATED CARRIER WAVE, RECTIFYING SAID CARRIER WAVE TO PROVIDE A SERIES OF POSITIVE VOLTAGE PULSES, APPLYING SAID POSITIVE VOLTAGE PULSES TO A RESONANT CIRCUIT TO DERIVE AN ALTERNATING OUTPUT SIGNAL THEREFROM, REDUCING THE FREQUENCY OF SAID ALTERNATING OUTPUT SIGNAL TO PROVIDE A REFERENCE SIGNAL, PROVIDING AN EXCESS OF SYNCHRONIZING SIGNAL TO INSURE AN ABSOLUTE PHASE RELATIONSHIP BETWEEN SAID REFERENCE SIGNAL AND SAID PHASE MODULATED CARRIER WAVE, AND COMPARING SAID REFERENCE SIGNAL WITH SAID PHASE MODULATED CARRIER WAVE.
Claim 2
Dependent Claim
97 words
IN A METHOD OF TRANSFERRING INFORMATION BY MEANS OF A PHASE MODULATED CARRIER WAVE, THE STEPS WHICH INCLUDE RECEIVING SAID MODULATED CARRIER WAVE, RECTIFYING SAID CARRIER WAVE TO PROVIDE A SERIES OF POSITIVE VOLTAGE PULSES, APPLYING SAID POSITIVE VOLTAGE PULSES TO A RESONANT CIRCUIT TO DERIVE AN ALTERNATING OUTPUT SIGNAL THEREFROM, REDUCING THE FREQUENCY OF SAID ALTERNATING OUTPUT SIGNAL TO PROVIDE A REFERENCE SIGNAL, PROVIDING AN EXCESS OF SYNCHRONIZING SIGNAL TO INSURE AN ABSOLUTE PHASE RELATIONSHIP BETWEEN SAID REFERENCE SIGNAL AND SAID PHASE MODULATED CARRIER WAVE, AND COMPARING SAID REFERENCE SIGNAL WITH SAID PHASE MODULATED CARRIER WAVE.
References Cited (Backward Citations)
GB370449A
Cited
US1922282A
Cited
US2064106A
Cited
US2259000A
Cited
US2340432A
Cited
US2565504A
Cited
US2513731A
Cited
US2676245A
Cited
US2833917A
Cited
US2991354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |