US4217318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of halide optical elements by hydrostatic press forging
Assignee: Honeywell Inc
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Filing: 1977-04-25
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Granted: 1980-08-12
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Expires: 1997-04-25
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
2026-11-02 18:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/5152; B; B29; B29D; B29D11/00; B29D11/0074; C04B35/622; C04B35/64; C04B35/645; G; G02; G02B; G02B1/00; H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
In a method of forming a fine-grained halide body by hot press forging an essentially single crystal halide body to reduce a dimension of the halide body along a first axis and cause a corresponding expansion of the halide body in directions normal to the first axis, thereby producing a fine-grained structure in the halide body, the improvement comprising applying, with a fluid which does not chemically react with the halide body, an essentially hydrostatic fluid pressure to the halide body while hot press forging, the fluid pressure being sufficient to inhibit cracking of the halide body while hot press forging.
Claim 2
Dependent Claim
101 words
In a method of forming a fine-grained halide body by hot press forging an essentially single crystal halide body to reduce a dimension of the halide body along a first axis and cause a corresponding expansion of the halide body in directions normal to the first axis, thereby producing a fine-grained structure in the halide body, the improvement comprising applying, with a fluid which does not chemically react with the halide body, an essentially hydrostatic fluid pressure to the halide body while hot press forging, the fluid pressure being sufficient to inhibit cracking of the halide body while hot press forging.
Claim 3
Dependent Claim
21 words
The invention of claim 1 wherein the halide body is of the group consisting of alkali halides and alkaline earth halides.
Claim 4
Independent Claim
120 words
A method of forming a fine-grained halide optical element, the method comprising: placing an essentially single crystal halide body in a chamber; causing motion of a piston along a first axis in the chamber to compress the crystalline halide body along the first axis and to cause a corresponding expansion of the halide body in directions normal to the first axis, thereby producing a fine-grained structure in the halide body; heating the halide body while causing motion of the piston; and applying, with a fluid which does not chemically react with the halide body, a hydrostatic fluid pressure to the halide body while compressing the halide body, the hydrostatic fluid pressure being sufficient to inhibit cracking of the halide body.
Claim 5
Independent Claim
120 words
A method of forming a fine-grained halide optical element, the method comprising: placing an essentially single crystal halide body in a chamber; causing motion of a piston along a first axis in the chamber to compress the crystalline halide body along the first axis and to cause a corresponding expansion of the halide body in directions normal to the first axis, thereby producing a fine-grained structure in the halide body; heating the halide body while causing motion of the piston; and applying, with a fluid which does not chemically react with the halide body, a hydrostatic fluid pressure to the halide body while compressing the halide body, the hydrostatic fluid pressure being sufficient to inhibit cracking of the halide body.
Claim 6
Dependent Claim
10 words
The method of claim 3 wherein the fluid is oil.
Claim 7
Dependent Claim
31 words
The method of claim 3 and further comprising periodically reversing the motion of the piston thereby periodically relieving the axial load on the crystalline halide body while maintaining the fluid pressure.
Claim 8
Dependent Claim
42 words
The method of claim 3 and further comprising annealing the halide body in the chamber while maintaining a hydrostatic fluid pressure after compressing the crystalline halide body to relieve residual stress in the crystalline halide body as a result of the compressing.
Claim 9
Dependent Claim
34 words
The method of claim 3 wherein placing the halide body in the chamber comprises placing the halide body in a closed die and placing the closed die and the halide body in the chamber.
Claim 10
Dependent Claim
21 words
The method of claim 3 wherein the halide body is of the group consisting of alkali halides and alkaline earth halides.
Claim 11
Dependent Claim
11 words
The method of claim 8 wherein the fluid is a gas.
Claim 12
Dependent Claim
10 words
The method of claim 9 wherein the gas is helium.
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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |