US4101331A
Expired / Lapsed
US
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Halide optical elements
Assignee: Honeywell Inc
•
Filing: 1977-03-15
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Granted: 1978-07-18
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Expires: 1997-03-15
Abstract
Abstract Fine-grained halide bodies are formed which have comparable optical properties to a single crystal halide body. The halide bodies are formed by press forging while an essentially constant fluid pressure is applied to the halide body.
Inventors
- 👤 Rogers H. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/553; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
An infrared transparent optical element comprising a crack-free, fully-dense alkaline earth fluoride body having a fine-grained crystalline structure throughout and having a grain size range of less than about 20μm.
Claim 2
Dependent Claim
30 words
An infrared transparent optical element comprising a crack-free, fully-dense alkaline earth fluoride body having a fine-grained crystalline structure throughout and having a grain size range of less than about 20μm.
Claim 3
Dependent Claim
29 words
The infrared transparent optical element of claim 1 wherein the alkaline earth fluoride body is of the group consisting of calcium fluoride, barium fluoride, strontium fluoride, and alloys thereof.
Claim 4
Dependent Claim
18 words
The infrared transparent optical element of claim 2 wherein the body has grain sizes less than about 20μm.
Claim 5
Dependent Claim
20 words
The infrared transparent optical element of claim 3 wherein the body has grain sizes between about 3μm and about 7μm.
Claim 6
Dependent Claim
16 words
The infrared transparent optical element of claim 1 wherein the body has a polygonized crystal structure.
Claim 7
Dependent Claim
14 words
The element according to claim 1 wherein the forging is along the <111> axis.
References Cited (Backward Citations)
GB913175A
Cited
US3359066A
Cited
US3301781A
Cited
US3365271A
Cited
US3933970A
Cited
US4013796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |