Patent US3228290A successfully refreshed from Google Patents.
US3228290A
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Large aperture anisotropic electro-optic shutter
Assignee: Individual
•
Filing: 1961-11-29
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Granted: 1966-01-11
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Expires: 1981-11-29
Abstract
No abstract record available.
Inventors
- 👤 James W Davisson
- 👤 Stewart I Slawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:44
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0305; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A LARGE APERTURE ELECTRO-OPTIC CRYSTAL SHUTTER COMPRISING AT LEAST ONE TRANSPARENT Z-CUT CRYSTAL HAVING A PLURALITY OF DIVERGING OPTIC AXES WITH A COMMON POINT OF CONVERGENCE, SAID CRYSTAL BEING FORMED WITH A PAIR OF OPPOSING SURFACES, A PAIR OF TRANSPARENT ELECTRODES POSITIONED ONE EACH ON SAID SURFACES OF SAID CRYSTAL TRANSVERSE TO SAID AXES, AT LEAST TWO POLARIZERS DISPOSED ONE EACH OPPOSITE EACH OF SAID ELECTRODES, AND A SOURCE OF ELECTRICAL ENERGY CONNECTED TO SAID ELECTRODES FOR STRESSING SAID CRYSTAL WHEN ACTUATED SO AS TO CONTROL THE AMOUNT OF LIGHT PASSING THROUGH SAID SHUTTER.
Claim 2
Dependent Claim
94 words
A LARGE APERTURE ELECTRO-OPTIC CRYSTAL SHUTTER COMPRISING AT LEAST ONE TRANSPARENT Z-CUT CRYSTAL HAVING A PLURALITY OF DIVERGING OPTIC AXES WITH A COMMON POINT OF CONVERGENCE, SAID CRYSTAL BEING FORMED WITH A PAIR OF OPPOSING SURFACES, A PAIR OF TRANSPARENT ELECTRODES POSITIONED ONE EACH ON SAID SURFACES OF SAID CRYSTAL TRANSVERSE TO SAID AXES, AT LEAST TWO POLARIZERS DISPOSED ONE EACH OPPOSITE EACH OF SAID ELECTRODES, AND A SOURCE OF ELECTRICAL ENERGY CONNECTED TO SAID ELECTRODES FOR STRESSING SAID CRYSTAL WHEN ACTUATED SO AS TO CONTROL THE AMOUNT OF LIGHT PASSING THROUGH SAID SHUTTER.
References Cited (Backward Citations)
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US2780958A
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US2811898A
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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 |