US4303635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc sulfide body for optical purposes
Assignee: Raytheon Co
•
Filing: 1980-05-15
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Granted: 1981-12-01
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Expires: 2000-05-15
Abstract
Abstract Optical-grade zinc sulfide bodies produced by the CVD technique and subjected to an aftertreatment under a high gas pressure and at elevated temperature possess improved optical properties. They are suited for use as infrared windows.
Inventors
- 👤 Fritz Aldinger
- 👤 Waltraud Werdecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:51
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/32; C03C3/321; G; G02; G02B; G02B1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A process for improving the light transmission from the 0.4 to about 0.5 micron wavelength range and the transmission at about 6 micron wavelength of an optical zinc sulfide body, produced by the CVD (Chemical Vapor Deposition) Technique which comprises contacting said optical zinc sulfide body at a temperature of at least 300° C. with a gas or gas mixture which is under a pressure ranging from 800 to 3000 bars, which gas or gas mixture does not react to the said optical zinc sulfide body.
Claim 2
Dependent Claim
86 words
A process for improving the light transmission from the 0.4 to about 0.5 micron wavelength range and the transmission at about 6 micron wavelength of an optical zinc sulfide body, produced by the CVD (Chemical Vapor Deposition) Technique which comprises contacting said optical zinc sulfide body at a temperature of at least 300° C. with a gas or gas mixture which is under a pressure ranging from 800 to 3000 bars, which gas or gas mixture does not react to the said optical zinc sulfide body.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein the gas is at a temperature of 600° to 1200° C.
Claim 4
Dependent Claim
11 words
A process according to claim 2, wherein the gas is argon.
Claim 5
Dependent Claim
13 words
A process according to claim 2, wherein the gas is an inert gas.
Claim 6
Dependent Claim
27 words
A process according to claim 4, wherein the gas is at a pressure of 1000 to 3000 bars and at a temperature of 850° to 1000° C.
Claim 7
Dependent Claim
24 words
A process according to claim 5, wherein the gas is under a pressure of 1200 bars and has a temperature of about 900° C.
Claim 8
Dependent Claim
18 words
A process according to claim 1, wherein said zinc sulfide body is in the form of a plate.
Claim 9
Dependent Claim
18 words
A process according to claim 1, wherein said zinc sulfide body is in the form of a dome.
References Cited (Backward Citations)
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US3178307A
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US3454685A
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US3362795A
Cited
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Cited
US3475116A
Cited
US4217318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |