Patent US349572A successfully refreshed from Google Patents.
US4248909A
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Chaoite coating process
Assignee: Aerospace Corp
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Filing: 1979-11-19
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Granted: 1981-02-03
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Expires: 1999-11-19
Abstract
Abstract A hard, transparent optical coating is formed on selected substrates by a deposition process in which carbon gas is quenched by and condenses on the substrate surface. The coating consists of one of the crystalline linear carbon forms, collectively known as carbynes, characterized by its hardness, stability, high refractive index and low optical absorption. The principal applications of the coating are for protective optical layers, and as antireflection or optical corrective films.
Inventors
- 👤 Arthur G. Whittaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:43
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C23; C23C; C23C14/00; C23C14/06; C23C14/0605; G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/111; G02B1/14; C03C2217/00; C03C2217/20; C03C2217/28; C03C2217/282; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/151
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
The process for forming a film on a substrate surface, said film consisting of one of the carbyne forms of carbon comprising the steps: (a) heating carbon to a temperature in the range of 2800° K. to 3200° K., in a closed partially evacuated chamber whereby to produce gaseous carbon at a temperature within the said range, the temperature of said gaseous carbon declining upon expansion away from carbon being heated; (b) subjecting the surface of the substrate to the gaseous carbon onto which the film is to be formed, said surface being oriented facewise toward the carbon being heated, and said surface being located at a distance from the carbon being heated whereat the gaseous carbon is reduced to a temperature in the approximate range of 26000°-2800° K. whereby the carbon gas is quenched on and by said surface to form the thin film consisting of carbyne.
Claim 2
Dependent Claim
148 words
The process for forming a film on a substrate surface, said film consisting of one of the carbyne forms of carbon comprising the steps: (a) heating carbon to a temperature in the range of 2800° K. to 3200° K., in a closed partially evacuated chamber whereby to produce gaseous carbon at a temperature within the said range, the temperature of said gaseous carbon declining upon expansion away from carbon being heated; (b) subjecting the surface of the substrate to the gaseous carbon onto which the film is to be formed, said surface being oriented facewise toward the carbon being heated, and said surface being located at a distance from the carbon being heated whereat the gaseous carbon is reduced to a temperature in the approximate range of 26000°-2800° K. whereby the carbon gas is quenched on and by said surface to form the thin film consisting of carbyne.
Claim 3
Dependent Claim
22 words
The process as defined in claim 1 wherein step (b) is carried out for a period of time of approximately 10 minutes.
Claim 4
Dependent Claim
25 words
The process as defined in claim 1 wherein step (b) is continued until the thickness of the film attains a thickness of 0.1 to 2.5.
Claim 5
Dependent Claim
27 words
The process as defined in claim 1 wherein the gaseous carbon is at a pressure of 100 microns to 200 microns at the surface of the substrate.
Claim 6
Dependent Claim
21 words
The process as defined in claim 4 wherein the pressure is partially maintained by the presence of an oxygen containing gas.
References Cited (Backward Citations)
US3904505A
Cited
US3733394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |