US4346131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerized solutions for depositing optical oxide coatings
Assignee: Westinghouse Electric Co LLC
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Filing: 1980-09-23
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Granted: 1982-08-24
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Expires: 2000-09-23
Abstract
Abstract A clear solution is prepared by reacting metal alkoxide with a mixture of critical amounts of water and/or acid in an alcohol diluted medium. Alkoxides may be Ti(OR)4 or Ta(OR)5, or another metal alkoxide such as Si(OR)4 in admixture with these alkoxides. Acids may be HCl or HNO3. Quarter wave inorganic optical coatings are deposited by applying the alkoxide solution to a substrate then heating the coating at over 350 DEG C. The coatings reduce reflectivity on silicon solar cells. The index of refraction of the coating can be varied by several techniques, including altering the proportion of titanium and silicon in the coating firing temperature, firing atmosphere. Thicknesses of the coating can be controlled by varying the rpm in spin application, withdrawal rate in dipping application, by concentration of the solution, by the type of solvent or the degree of polymerization of the titanium complexes.
Inventors
- 👤 Bulent E. Yoldas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:40
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/30; H10F77/306; H10F77/311; H10F77/315; C; C08; C08G; C08G79/00; C09; C09D; C09D185/00; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T428/1352; Y10T428/1355; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
146 words
A substrate having an oxide coating thereon which has a predetermined index of refraction between about 1.4 and about 2.4 made by (A) preparing a clear solution which comprises: (1) alkoxide having the general formula M(OR) n where M is selected from the group consisting of 0 to 100% Ti, 0 to 25% Si, 0 to 100% Ta, and up to 15% of a metal ion which forms an alkoxide, R is alkyl from C 1 to C 6 , and n is the valence of M; (2) about 1.7 to about 4 moles of water per mole of alkoxide; (3) sufficient alcohol to give a solids content of about 0.1 to about 15% and (4) a sufficient amount of a suitable acid to prevent cloudiness; (B) applying said clear solution to said substrate; and (C) heating said substrate to about 300° to about 600° C.
Claim 2
Dependent Claim
146 words
A substrate having an oxide coating thereon which has a predetermined index of refraction between about 1.4 and about 2.4 made by (A) preparing a clear solution which comprises: (1) alkoxide having the general formula M(OR) n where M is selected from the group consisting of 0 to 100% Ti, 0 to 25% Si, 0 to 100% Ta, and up to 15% of a metal ion which forms an alkoxide, R is alkyl from C 1 to C 6 , and n is the valence of M; (2) about 1.7 to about 4 moles of water per mole of alkoxide; (3) sufficient alcohol to give a solids content of about 0.1 to about 15% and (4) a sufficient amount of a suitable acid to prevent cloudiness; (B) applying said clear solution to said substrate; and (C) heating said substrate to about 300° to about 600° C.
Claim 3
Dependent Claim
12 words
A coated substrate according to claim 1 wherein said substrate is silicon.
Claim 4
Dependent Claim
16 words
A coated substrate according to claim 2 wherein said silicon is part of a solar cell.
Claim 5
Dependent Claim
18 words
A coated substrate according to claim 1 wherein said coating is about 600 to about 750 A thick.
Claim 6
Dependent Claim
18 words
A coated substrate according to claim 1 wherein said substrate is the inside of an incandescent light bulb.
Claim 7
Dependent Claim
16 words
A coated substrate according to claim 1 wherein M is a mixture of Ti and Si.
Claim 8
Dependent Claim
12 words
A coated substrate according to claim 1 wherein M is all Ti.
Claim 9
Dependent Claim
19 words
A coated substrate according to claim 1 wherein said solution is aged then applied to said substrate by dipping.
Claim 10
Dependent Claim
22 words
A coated substrate according to claim 1 wherein R is selected from the group consisting of ethyl, isopropyl, butyl, and mixtures thereof.
Claim 11
Dependent Claim
19 words
A coated substrate according to claim 1 wherein steps (B) and (C) are repeated to produce a two-layered coating.
Claim 12
Dependent Claim
23 words
A coated substrate according to claim 1 wherein the amount of said acid is less than 0.1 moles per mole of said alkoxide.
Claim 13
Dependent Claim
14 words
A coated substrate according to claim 11 wherein said acid is nitric or hydrochloric.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |