Patent US4109520A successfully refreshed from Google Patents.
US3174044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light frequency modulator
Assignee: AT&T Inc
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Filing: 1961-05-09
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Granted: 1965-03-16
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Expires: 1981-05-09
Abstract
No abstract record available.
Inventors
- 👤 Ping K Tien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
APPARATUS FOR MODULATING THE FREQUENCY OF COHERENT MONOCHROMATIC ELECTROMAGENTIC RADIATION IN THE OPTICAL FREQUENCY RANGE COMPRISING A MODULATOR MEDIUM SUBSTANTIALLY TRANSPARENT TO RADIATION IN THE FREQUENCY RANGE OF THAT TO BE MODULATED, MEANS FOR PRODUCING A COLUMN OF LONGIDUTINAL HYPERSONIC ACOUSTIC WAVES OF FREQUENCY WS IN SAID MEDIUM, MEANS FOR DIRECTING A BEAM OF COHERENT MONOCHROMATIC RADIATION OF FREQUENCY WI TO BE MODULATED INTO SAID COLUMN AT AN ACUTE ANGLE $ TO THE ACOUSTIC WAVEFRONT WHERE $ IS DEFINED BY THE RELATION
References Cited (Backward Citations)
US2622470A
Cited
US3055258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |