Patent US3744875A successfully refreshed from Google Patents.
US3744875A
Expired / Lapsed
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Ferroelectric electrooptic devices
Assignee: United States Atomic Energy Commission
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Filing: 1971-12-01
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Granted: 1973-07-10
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Expires: 1991-12-01
Abstract
Abstract An optical quality, slim-loop type, electrically induced ferroelectric ceramic plate made of essentially cubic phase, normally optically isotropic lead zirconate-lead titanate solid solution, an optically transparent, electrically conductive electrode disposed on each of the plate surfaces at locations in alignment through said plate, means for applying an electric field to the plate between the aligned electrodes to change said plate from the normal cubic phase to an induced ferroelectric phase and from the normal optically isotropic condition to an electrically induced anisotropic and birefringent condition, and means for sensing the change in optical condition.
Inventors
- 👤 G Haertling
- 👤 C Mccampbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/055
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
The device of claim 1 including optical means for sensing the change in said plate between said electrically induced anisotropic condition and said optically isotropic condition.
Claim 2
Dependent Claim
59 words
The device of claim 2 wherein said sensing means includes a polarizer positioned between said light supplying means on one side of said ceramic plate and an analyzer disposed optically at an angle of 90* with respect to said polarizer adjacent the other side of said ceramic plate in optical alignment with said light source, polarizer and ceramic plate.
Claim 3
Dependent Claim
21 words
The device of claim 1 wherein said electrodes cover a substantial portion of said optical quality surfaces of said ceramic plate.
Claim 4
Dependent Claim
59 words
The device of claim 1 including a plurality of elongated electrodes on at least one of said surfaces and positioned in a predetermined array and wherein said switching means includes means for applying electric fields between selected of said elongated electrodes and the electrode on said other plate surface to switch selected portions of said plate in symbolic patterns.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |