US3154748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector for optical communication system
Assignee: AT&T Inc
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Filing: 1961-12-29
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Granted: 1964-10-27
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Javan Ali
- 👤 Kompfner Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:38
CPC Classifications
G; G02; G02F; G02F2/00; G02F2/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
APPARATUS FOR RECOVERING SIGNAL WAVE INFORMATION FROM A MODULATED OPTICAL WAVELENGTH CARRIER COMPRISING A PHOTOEMISSIVE LAYER DISPOSED UPON AN ENERGY REFLECTING SURFACE, MEANS FOR ILLUMINATING SAID LAYER WITH SIGNAL MODULATED OPTICAL WAVELENGTH ENERGY, MEANS FOR REREFLECTING TOWARD SAID LAYER THE PORTION OF SAID SIGNAL ENERGY REFLECTED FROM SAID SURFACE, MEANS FOR GENERATING COHERENT OPTICAL WAVELENGTH ENERGY OF A SUBSTANTIALLY SINGLE CONSTANT FREQUENCY, MEANS FOR ILLUMINATING SAID LAYER WITH SAID CONSTANT FREQUENCY OPTICAL WAVELENGTH ENERGY, SAID LAST MENTIONED ILLUMINATION BEING SIMULTANEOUS WITH THE ILLUMINATION OF SAID LAYER WITH SAID SIGNAL MODULATED OPTICAL WAVELENGTH ENERGY, MEANS FOR REREFLECTING TOWARD SAID LAYER THE PORTION OF SAID CONSTANT FREQUENCY ENERGY REFLECTED FROM SAID SURFACE, THE ILLUMINATION OF SAID PHOTOEMISSIVE LAYER BY SAID SIGNAL MODULATED AND SAID CONSTANT FREQUENCY OPTICAL WAVELENGTH ENERGY PRODUCING THE EMISSION OF A STREAM OF PHOTOELECTRONS FROM SAID LAYER, AND MEANS FOR EXTRACTING FROM SAID PHOTOELECTRON STREAM A FREQUENCY MODULATED SUBCARRIER HAVING AN INSTANTANEOUS FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE INSTANTANEOUS FREQUENCY OF SAID SIGNAL MODULATED OPTICAL WAVELENGTH ENERGY AND SAID CONSTANT FREQUENCY, SAID EXTRACTING MEANS COMPRISING A SLOW WAVE CIRCUIT POSITIONED IN COUPLING RELATIONSHIP TO SAID PHOTOELECTRON STREAM.
Claim 2
Dependent Claim
189 words
APPARATUS FOR RECOVERING SIGNAL WAVE INFORMATION FROM A MODULATED OPTICAL WAVELENGTH CARRIER COMPRISING A PHOTOEMISSIVE LAYER DISPOSED UPON AN ENERGY REFLECTING SURFACE, MEANS FOR ILLUMINATING SAID LAYER WITH SIGNAL MODULATED OPTICAL WAVELENGTH ENERGY, MEANS FOR REREFLECTING TOWARD SAID LAYER THE PORTION OF SAID SIGNAL ENERGY REFLECTED FROM SAID SURFACE, MEANS FOR GENERATING COHERENT OPTICAL WAVELENGTH ENERGY OF A SUBSTANTIALLY SINGLE CONSTANT FREQUENCY, MEANS FOR ILLUMINATING SAID LAYER WITH SAID CONSTANT FREQUENCY OPTICAL WAVELENGTH ENERGY, SAID LAST MENTIONED ILLUMINATION BEING SIMULTANEOUS WITH THE ILLUMINATION OF SAID LAYER WITH SAID SIGNAL MODULATED OPTICAL WAVELENGTH ENERGY, MEANS FOR REREFLECTING TOWARD SAID LAYER THE PORTION OF SAID CONSTANT FREQUENCY ENERGY REFLECTED FROM SAID SURFACE, THE ILLUMINATION OF SAID PHOTOEMISSIVE LAYER BY SAID SIGNAL MODULATED AND SAID CONSTANT FREQUENCY OPTICAL WAVELENGTH ENERGY PRODUCING THE EMISSION OF A STREAM OF PHOTOELECTRONS FROM SAID LAYER, AND MEANS FOR EXTRACTING FROM SAID PHOTOELECTRON STREAM A FREQUENCY MODULATED SUBCARRIER HAVING AN INSTANTANEOUS FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE INSTANTANEOUS FREQUENCY OF SAID SIGNAL MODULATED OPTICAL WAVELENGTH ENERGY AND SAID CONSTANT FREQUENCY, SAID EXTRACTING MEANS COMPRISING A SLOW WAVE CIRCUIT POSITIONED IN COUPLING RELATIONSHIP TO SAID PHOTOELECTRON STREAM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |