Patent US3721628A successfully refreshed from Google Patents.
US3721628A
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Ferroelectric materials and infrared detector device containing same
Assignee: US Philips Corp
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Filing: 1971-04-26
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Granted: 1973-03-20
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Expires: 1991-04-26
Abstract
Abstract An organic pyroelectric material such as triglycine sulphate in which a permanent poling of the crystal is effected by addition of a doping ingredient possessing pseudosymmetry. The poled crystal may be used for constructing an optical device or a pyroelectric detector.
Inventors
- 👤 P Lock
- 👤 E Keve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:28
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The ferroelectric material of claim 1 wherein the triglycine ester is triglycine sulfate.
Claim 2
Dependent Claim
12 words
The material of claim 1 wherein the doping ingredient is Alpha -alanine.
Claim 3
Independent Claim
69 words
A method of preparing poled crystals of a ferroelectric material comprising growing crystals from a solution of a triglycine ester selected from the group consisting of triglycine sulfate, triglycine selenate and triglycine fluoroberyllate and deuterium substitution products thereof and a sufficient amount of a doping ingredient selected from the group consisting of Alpha -alanine, Alpha -amino-n-butyric acid, serine and sarcosine to cause the resultant crystals to be permanently poled.
Claim 4
Dependent Claim
24 words
The method of claim 4 wherein the doping ingredient is selected from the group consisting of Alpha -alanine, Alpha -amino-n-butyric acid, serine and sarcosine.
Claim 5
Dependent Claim
11 words
An infrared detector device including the poled material of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |