Patent US3229095A successfully refreshed from Google Patents.
US3229095A
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Apparatus for obtaining the difference of two incident optical radiations
Assignee: International Business Machines Corp
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Filing: 1963-05-20
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Granted: 1966-01-11
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Expires: 1983-05-20
Abstract
No abstract record available.
Inventors
- 👤 Gordon J Lasher
- 👤 Jr Arthur H Nethercot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/0007; G; G02; G02F; G02F1/00; G02F1/35; G02F1/353; G02F1/3534
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A FAR INFRA-RED RADIATION SOURCE OPERABLE IN FREE SPACE AND COMPRISING A HIGH MOBILITY SMALL BANDGAP SEMICONDUCTOR CRYSTAL HAVING A SURFACE REGION OF ONE CONDUCTIVITY TYPE, ELECTRODES CONNECTED ACROSS SAID CRYSTAL TO DEFINE SAID SURFACE REGION AND ARRANGED FOR CONNECTION TO A SOURCE OF UNIDIRECTIONAL BIAS VOLTAGE, APPARATUS FOR PROVIDING COHERENT OPTICAL RADIATION DIRECTED TO SAID SURFACE REGION AT TWO WAVELENGTHS, THE DIFFERENCE IN FREQUENCIES OF SAID TWO WAVELENGTHS BEING EQUAL TO THE FREQUENCY OF THE DESIRED RADIATION OUTPUT.
Claim 2
Dependent Claim
79 words
A FAR INFRA-RED RADIATION SOURCE OPERABLE IN FREE SPACE AND COMPRISING A HIGH MOBILITY SMALL BANDGAP SEMICONDUCTOR CRYSTAL HAVING A SURFACE REGION OF ONE CONDUCTIVITY TYPE, ELECTRODES CONNECTED ACROSS SAID CRYSTAL TO DEFINE SAID SURFACE REGION AND ARRANGED FOR CONNECTION TO A SOURCE OF UNIDIRECTIONAL BIAS VOLTAGE, APPARATUS FOR PROVIDING COHERENT OPTICAL RADIATION DIRECTED TO SAID SURFACE REGION AT TWO WAVELENGTHS, THE DIFFERENCE IN FREQUENCIES OF SAID TWO WAVELENGTHS BEING EQUAL TO THE FREQUENCY OF THE DESIRED RADIATION OUTPUT.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |