US3196274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light beam demodulator
Assignee: AT&T Inc
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Filing: 1961-12-12
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Granted: 1965-07-20
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Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Giordmaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:43
CPC Classifications
G; G02; G02F; G02F2/00; G02F2/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A LIGHT DEMODULATOR COMPRISING A PHOTOEMISSIVE SURFACE RESPONSIVE TO RADIANT ENERGY OVER A RANGE OF FREQUENCIES WITHIN THE OPTICAL RANGE; AN OPTICAL FREQUENCY CARRIER HAVING A CARRIER FREQUENCY FC WITHIN SAID RANGE AND MODULATED BY AN INTERMEDIATE FREQUENCY CARRIED $F WHICH BEARS MODULATION INTELLIGENCE OF A PRESCRIBED FREQUENCY; A LOCAL OSCILLATOR FOR PROVIDING WAVE ENERGY AT A FREQUENCY DIFFERENT THAN SIAD INTERMEDIATE FREQUENCY CARRIER BY AN AMOUNT $F, WHERE $F IS LARGER THAN SAID PRESCRIBED FREQUENCY AND LESS THAN 1000 MEGACYCLES PER SECOND; SAID PHOTOEMISSIVE SURFACE BEING SIMULTANEOUSLY EXPOSED TO A BEAM OF SAID MODULATED OPTICAL FREQUENCY CARRIER AND TO LOCAL OSCILLATOR WAVER ENERGY; AND MEANS FOR EXTRACTING WAVE ENERGY FROM SAID DEMODULATOR AT SAID DIFFERENCE FREQUENCY $F.
Claim 2
Dependent Claim
118 words
A LIGHT DEMODULATOR COMPRISING A PHOTOEMISSIVE SURFACE RESPONSIVE TO RADIANT ENERGY OVER A RANGE OF FREQUENCIES WITHIN THE OPTICAL RANGE; AN OPTICAL FREQUENCY CARRIER HAVING A CARRIER FREQUENCY FC WITHIN SAID RANGE AND MODULATED BY AN INTERMEDIATE FREQUENCY CARRIED $F WHICH BEARS MODULATION INTELLIGENCE OF A PRESCRIBED FREQUENCY; A LOCAL OSCILLATOR FOR PROVIDING WAVE ENERGY AT A FREQUENCY DIFFERENT THAN SIAD INTERMEDIATE FREQUENCY CARRIER BY AN AMOUNT $F, WHERE $F IS LARGER THAN SAID PRESCRIBED FREQUENCY AND LESS THAN 1000 MEGACYCLES PER SECOND; SAID PHOTOEMISSIVE SURFACE BEING SIMULTANEOUSLY EXPOSED TO A BEAM OF SAID MODULATED OPTICAL FREQUENCY CARRIER AND TO LOCAL OSCILLATOR WAVER ENERGY; AND MEANS FOR EXTRACTING WAVE ENERGY FROM SAID DEMODULATOR AT SAID DIFFERENCE FREQUENCY $F.
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) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |