US3175088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical frequency modulation and heterodyne recovery system
Assignee: AT&T Inc
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Filing: 1961-06-22
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Granted: 1965-03-23
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Expires: 1981-06-22
Abstract
No abstract record available.
Inventors
- 👤 Donald R Herriott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:08
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/112; G; G02; G02F; G02F2/00; G02F2/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A COMMUNICATION SYSTEM WHICH COMPRISES A SOURCE OF A BEAM OF LIGHT, MEANS FOR SPLITTING SAID BEAM INTO TWO COMPONENT BEAMS WHEREBY ANY FLUCTUATIONS OF THE LIGHT OF SAID SOURCE ARE IDENTICALLY REPRODUCED IN SAID TOW COMPONENT BEAMS, A SOURCE OF A BAND-LIMITED MESSAGE WAVE, MEANS FOR MODULATING THE FREQUENCY OF THE FIRST OF SAID BEAMS BY SAID MESSAGE WAVE, MEANS FOR SHIFTING THE FREQUENCY OF THE SECOND OF SAID BEAMS BY A FIXED AMOUNT IN EXCESS OF THE MESSAGE WAVE BAND LIMIT, MEANS FOR RECOMBINING SAID FREQUENCY-SHIFTED BEAM WITH SAID FREQUENCY-MODULATED BEAM TO FORM A COMPOSITE BETWEEN, MEANS FOR TRANSMITTING SAID COMPOSITE BEAM TO A RECEIVER STATION AND, AT SAID RECEIVER STATION, MEANS FOR DEVELOPING
Claim 2
Dependent Claim
116 words
A COMMUNICATION SYSTEM WHICH COMPRISES A SOURCE OF A BEAM OF LIGHT, MEANS FOR SPLITTING SAID BEAM INTO TWO COMPONENT BEAMS WHEREBY ANY FLUCTUATIONS OF THE LIGHT OF SAID SOURCE ARE IDENTICALLY REPRODUCED IN SAID TOW COMPONENT BEAMS, A SOURCE OF A BAND-LIMITED MESSAGE WAVE, MEANS FOR MODULATING THE FREQUENCY OF THE FIRST OF SAID BEAMS BY SAID MESSAGE WAVE, MEANS FOR SHIFTING THE FREQUENCY OF THE SECOND OF SAID BEAMS BY A FIXED AMOUNT IN EXCESS OF THE MESSAGE WAVE BAND LIMIT, MEANS FOR RECOMBINING SAID FREQUENCY-SHIFTED BEAM WITH SAID FREQUENCY-MODULATED BEAM TO FORM A COMPOSITE BETWEEN, MEANS FOR TRANSMITTING SAID COMPOSITE BEAM TO A RECEIVER STATION AND, AT SAID RECEIVER STATION, MEANS FOR DEVELOPING
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |