US3257508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-synchronous phase shift communication system
Assignee: Robertshaw Controls Co
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Filing: 1962-11-05
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Granted: 1966-06-21
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Expires: 1982-11-05
Abstract
No abstract record available.
Inventors
- 👤 Cecil A Crafts
- 👤 Jr Perry H Goodwin
- 👤 Robert L Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:33
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2335; H04L27/20; H04L27/2032; H04L27/2035
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
THE METHOD OF TRANSMITTING BINARY INFORMATION AS DISCRETE PHASE SHIFTS IN A TRANSMITTED WAVE SUPPLIED AT FIXED FREQUENCY COMPRISING (A) SHIFTING THE PHASE OF THE WAVE IN PAIRED EQUAL AND OPPOSITE INCREMENTS ACCORDING TO A BINARY INFORMATION SIGNAL, (B) LIMITING THE OUTPUT FREQUENCY OF TRANSMITTED WAVE TO PASS DEVIATIONS FROM SAID FREQUENCY DUE TO SAID PHASE SHIFT AS TRANSIENTS OF FREQUENCY LESS THAN A PREDETERMINED AMOUNT AND EXTENDING OVER A PLURALITY OF CYCLES THEREOF, (C) RECEIVING SAID TRANSMITTED WAVE WITH SAID TRANSIENT FREQUENCY INCREMENTS, (D) BAND PASS FILTERING SAID RECEIVED WAVE TO FURTHER CONFINE RECEIVED ENERGY TO NARROW LIMITS OF TRANSIENT FREQUENCY AT THE TIME OF PHASE SHIFT IN SAID TRANSMITTER, AND (E) CONVERTING SAID FREQUENCY TRANSIENTS TO A BINARY SIGNAL CORRESPONDING TO SAID PAIRED EQUAL INCREMENTS OF PHASE SHIFT.
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |