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Patent US4053207A successfully refreshed from Google Patents.
US4053207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optic devices
Assignee: US Philips Corp
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Filing: 1976-05-19
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Granted: 1977-10-11
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Expires: 1996-05-19
Abstract
Abstract An electro-optic device having a platelet of PLZT material, the birefringence of which depends on an electric field. The thickness of the platelet preferably is smaller than the thickness of one grain. As a result of this the sensitivity is large and this permits a low operating voltage in the device.
Inventors
- 👤 Edward T. Keve
- 👤 Keith L. Bye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/055
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
45 words
An electro-optic device including a platelet of a ferroelectric ceramic material having an electric field-dependent birefringence value and the individual grains of which have a domain structure, in which the thickness of the platelet is smaller than twice the average grain diameter of the material.
Claim 2
Dependent Claim
45 words
An electro-optic device including a platelet of a ferroelectric ceramic material having an electric field-dependent birefringence value and the individual grains of which have a domain structure, in which the thickness of the platelet is smaller than twice the average grain diameter of the material.
Claim 3
Dependent Claim
25 words
A device as claimed in claim 1, in which the thickness of the platelet is smaller than once the average grain diameter of the material.
Claim 4
Dependent Claim
30 words
A device as claimed in claim 2, in which the thickness of the platelet is equal to one half to one quarter of the average grain diameter of the material.
Claim 5
Dependent Claim
20 words
A device as claimed in claim 1, in which the platelet of ceramic material is secured to a supporting substrate.
Claim 6
Dependent Claim
18 words
A device as claimed in claim 1, in which a surface of the platelet carries an electrode structure.
Claim 7
Dependent Claim
18 words
A device as claimed in claim 1, in which the ferroelectric ceramic material is lanthanum-doped lead zirconate titanate.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |