Patent US3436545A successfully refreshed from Google Patents.
US3436545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared modulator magnetically biased to cyclotron resonance condition
Assignee: AT&T Inc
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Filing: 1963-12-30
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Granted: 1969-04-01
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Expires: 1983-12-30
Abstract
No abstract record available.
Inventors
- 👤 Paul L Richards
- 👤 George E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:24
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A CONTROLLABLE PHASE RETARDATION DEVICE FOR INFRARED ENERGY COMPRISING: A TRANSMITTING AND ROTATING MEDIUM OF SEMICONDUCTIVE MATERIAL HAVING A PLASMA FREQUENCY WP LESS THAN THE LOWEST FREQUENCY WG FOR WHICH INTERBAND TRANSITIONS OCCUR, MEANS FOR APPLYING A MAGNETIC FIELD TO SAID MEDIUM OF A STRENGTH DEFINING A CYCLOTRON RESONANCE FREQUENCY WC FOR SAID MEDIUM IN THE INFRARED REGION OF THE SPECTRUM BETWEEN WP AND WG, MEANS FOR APPLYING TO SAID MEDIUM SAID INFRARED ENERGY OF A FREQUENCY WO DIFFERENT FROM WC BUT BETWEEN WP AND WG, AND MEANS FOR RAISING THE CARRIER TEMPERATURE WITHIN SAID MEDIUM INDEPENDENTLY OF ITS LATTICE TEMPERATURE, SAID LAST MENTIONED MEANS COMPRISING A VOLTAGE SOURCE CONNECTED ACROSS SAID MEDIUM, WHEREBY THE PHASE RETARDATION UNDERGONE BY SAID INFRARED ENERGY PROPAGATING THROUGH SAID MEDIUM IS CONTROLLABLE BY VARYING THE VOLTAGE SOURCE.
Claim 2
Dependent Claim
133 words
A CONTROLLABLE PHASE RETARDATION DEVICE FOR INFRARED ENERGY COMPRISING: A TRANSMITTING AND ROTATING MEDIUM OF SEMICONDUCTIVE MATERIAL HAVING A PLASMA FREQUENCY WP LESS THAN THE LOWEST FREQUENCY WG FOR WHICH INTERBAND TRANSITIONS OCCUR, MEANS FOR APPLYING A MAGNETIC FIELD TO SAID MEDIUM OF A STRENGTH DEFINING A CYCLOTRON RESONANCE FREQUENCY WC FOR SAID MEDIUM IN THE INFRARED REGION OF THE SPECTRUM BETWEEN WP AND WG, MEANS FOR APPLYING TO SAID MEDIUM SAID INFRARED ENERGY OF A FREQUENCY WO DIFFERENT FROM WC BUT BETWEEN WP AND WG, AND MEANS FOR RAISING THE CARRIER TEMPERATURE WITHIN SAID MEDIUM INDEPENDENTLY OF ITS LATTICE TEMPERATURE, SAID LAST MENTIONED MEANS COMPRISING A VOLTAGE SOURCE CONNECTED ACROSS SAID MEDIUM, WHEREBY THE PHASE RETARDATION UNDERGONE BY SAID INFRARED ENERGY PROPAGATING THROUGH SAID MEDIUM IS CONTROLLABLE BY VARYING THE VOLTAGE SOURCE.
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) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |