Patent US3265813A successfully refreshed from Google Patents.
US3265813A
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Phase shift keying communication system
Assignee: Robertshaw Controls Co
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Filing: 1962-05-04
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Granted: 1966-08-09
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Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Maynard D Mcfarlane
- 👤 Cecil A Crafts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:43
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2035; H04L27/2042; H04L27/2046; H04L27/22; H04L27/227; H04L27/2275; H04L27/2276
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN A RECEIVER FOR A SINGLE FREQUENCY COMMUNICATION WAVE MODULATED IN KEYED SHIFTS OF PHASE EACH A PROPER FRACTION OF A CYCLE OF WHICH THE DENOMINATOR IS A PREDETERMINED INTEGER THAN 2, A RECEIVER FOR SAID WAVE PRODUCING VOLTAGE PEAKS CORRESPONDING TO SIMILAR PEAKS PRESENT IN THE WAVE PHASE INSTANTLY TRANSMITTED, A FREQUENCY MULTIPLIER GENERATING A WAVE HAVING VOLTAGE PEAKS COINCIDENT WITH VOLTAGE PEAKS OF SAID COMMUNICATION WAVE IN EACH TRANSMITTED PHASE THEREOF, A RING COUNTER CIRCUIT CONNECTED FOR STEPPED OPERATION AT THE FREQUENCY OF SAID GENERATED WAVE AND HAVING A NUMBER OF STEPS TO COMPLETE A CYCLE EQUAL TO SAID INTEGER AND AN OUTPUT CORRESPONDING TO EACH STEP, AND MEANS SELECTING AND APPLYING TO EACH SAID OUTPUT A SIGNAL CORRESPONDING TO EACH COINCIDENCE OF WAVE PEAKS OF SAID GENERATED WAVE AND SAID PRODUCED VOLTAGE OF THE INSTANTLY RECEIVED WAVE.
Claim 2
Dependent Claim
140 words
IN A RECEIVER FOR A SINGLE FREQUENCY COMMUNICATION WAVE MODULATED IN KEYED SHIFTS OF PHASE EACH A PROPER FRACTION OF A CYCLE OF WHICH THE DENOMINATOR IS A PREDETERMINED INTEGER THAN 2, A RECEIVER FOR SAID WAVE PRODUCING VOLTAGE PEAKS CORRESPONDING TO SIMILAR PEAKS PRESENT IN THE WAVE PHASE INSTANTLY TRANSMITTED, A FREQUENCY MULTIPLIER GENERATING A WAVE HAVING VOLTAGE PEAKS COINCIDENT WITH VOLTAGE PEAKS OF SAID COMMUNICATION WAVE IN EACH TRANSMITTED PHASE THEREOF, A RING COUNTER CIRCUIT CONNECTED FOR STEPPED OPERATION AT THE FREQUENCY OF SAID GENERATED WAVE AND HAVING A NUMBER OF STEPS TO COMPLETE A CYCLE EQUAL TO SAID INTEGER AND AN OUTPUT CORRESPONDING TO EACH STEP, AND MEANS SELECTING AND APPLYING TO EACH SAID OUTPUT A SIGNAL CORRESPONDING TO EACH COINCIDENCE OF WAVE PEAKS OF SAID GENERATED WAVE AND SAID PRODUCED VOLTAGE OF THE INSTANTLY RECEIVED WAVE.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |