Patent US3157740A successfully refreshed from Google Patents.
US3157740A
Expired / Lapsed
US
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Transmitter and receiver for phase modulated signals of the relative phase shift type
Assignee: Robertshaw Controls Co
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Filing: 1960-11-17
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Granted: 1964-11-17
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Expires: 1980-11-17
Abstract
No abstract record available.
Inventors
- 👤 Cecil A Crafts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:13
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2053; H04L27/2057; H04L27/22; H04L27/227; H04L27/2275; H04L27/2276
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A COMMUNICATION SYSTEM WHEREIN INFORMATION IS TRANSMITTED ON A SINGLE FREQUENCY CARRIER WAVE IN THE FORM OF KEYED SHIFTS OF PHASE EACH EQUAL TO N$ WHERE N$=360*, N IS AN ODD INTEGER LARGER THAN 2, AND N IS AN INTEGER FROM 1 TO N-1, TRANSMITTER APPARATUS COMPRISING AN OSCILLATOR OPERATING AT SAID FREQUENCY, PHASE SHIFTING MEANS FOR ALTERING THE PHASE OF SAID CARRIER WAVE IN N SELECTABLE MULTIPLES OF $, N GATING CIRCUITS EACH CONNECTED FOR SELECTIVE CONTROL OF SAID PHASE SHIFTING MEANS,
Claim 2
Dependent Claim
84 words
IN A COMMUNICATION SYSTEM WHEREIN INFORMATION IS TRANSMITTED ON A SINGLE FREQUENCY CARRIER WAVE IN THE FORM OF KEYED SHIFTS OF PHASE EACH EQUAL TO N$ WHERE N$=360*, N IS AN ODD INTEGER LARGER THAN 2, AND N IS AN INTEGER FROM 1 TO N-1, TRANSMITTER APPARATUS COMPRISING AN OSCILLATOR OPERATING AT SAID FREQUENCY, PHASE SHIFTING MEANS FOR ALTERING THE PHASE OF SAID CARRIER WAVE IN N SELECTABLE MULTIPLES OF $, N GATING CIRCUITS EACH CONNECTED FOR SELECTIVE CONTROL OF SAID PHASE SHIFTING MEANS,
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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |