Patent US3753775A successfully refreshed from Google Patents.
US3753775A
Expired / Lapsed
US
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Chemical polishing of sapphire
Assignee: RCA Corp
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Filing: 1971-03-01
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Granted: 1973-08-21
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Expires: 1991-03-01
Abstract
Abstract The (1102) crystallographic oriented surface of a sapphire body is chemically polished by heating the body to a temperature of between 1,000*C and 1,200*C and contacting the surface of the body with vapors of borax.
Inventors
- 👤 P Robinson
- 👤 R Wance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:38
CPC Classifications
C; C09; C09K; C09K13/00; C09K13/04; C09K13/10; Y; Y10; Y10S; Y10S148/00; Y10S148/017; Y10S148/051; Y10S148/15; Y10S438/00; Y10S438/967
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The method of claim 1 wherein the body is heated to a temperature of between 100*C and 1200*C.
Claim 2
Dependent Claim
20 words
The method of claim 2 wherein the (1102) crystallographic oriented surface of the body is contacted with the borax vapors.
Claim 3
Independent Claim
47 words
A method of polishing the surface of a body of sapphire comprising the steps of supporting the body over a charge of borax, heating the body, and heating the borax to its vaporization tempera-ture so as to provide borax vapors which contact the surface of the body.
Claim 4
Dependent Claim
18 words
The method of claim 4 wherein the body is heated to a temperature of between 1000*C and 1200*C.
Claim 5
Dependent Claim
23 words
The method of claim 5 wherein the body has a (1102) crystallographic oriented surface and said surface is exposed to the borax vapors.
Claim 6
Independent Claim
37 words
A method of forming a composite article comprising contacting a surface of a body of sapphire with vapors of borax to polish said surface, and growing a film of epitaxial silicon on said surface of the body.
References Cited (Backward Citations)
US3476617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |