US4496398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antireflective coating composition
Assignee: BP Solar International LLC
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Filing: 1983-10-24
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Granted: 1985-01-29
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Expires: 2003-10-24
Abstract
Abstract A metal organic paste. The paste contains a metal alkoxide, a thickening or suspension agent, a solvent for the alkoxide and an effective amount of an anhydride.
Inventors
- 👤 Daniel L. Whitehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/30; H10F77/306; H10F77/311; H10F77/315; C; C09; C09D; C09D101/00; C09D101/08; C09D101/26; C09D101/28; Y; Y02; Y02E; Y02E10/00; Y02E10/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A composition suitable for application onto the light impinging surface of a substrate for forming an antireflective coating thereon comprising: (a) a thickening or suspension agent; (b) a metal alkoxide, said metal being selected from the group consisting of tantalum, titanium, niobium, yttrium, zirconium, tellurium, and mixtures thereof; (c) a solvent for said thickening or suspension agent; and (d) an anhydride containing four to twelve carbon atoms, said anhydride being present in an amount effective to provide a denser film of a higher refractive index.
Claim 2
Dependent Claim
85 words
A composition suitable for application onto the light impinging surface of a substrate for forming an antireflective coating thereon comprising: (a) a thickening or suspension agent; (b) a metal alkoxide, said metal being selected from the group consisting of tantalum, titanium, niobium, yttrium, zirconium, tellurium, and mixtures thereof; (c) a solvent for said thickening or suspension agent; and (d) an anhydride containing four to twelve carbon atoms, said anhydride being present in an amount effective to provide a denser film of a higher refractive index.
Claim 3
Dependent Claim
21 words
The composition of claim 1, wherein the thickening or suspension agent is selected from the group consisting of methylcellulose and ethylcellulose.
Claim 4
Dependent Claim
30 words
The composition of claim 1, wherein said solvent is selected from the group consisting of an aliphatic alcohol having at least six carbon atoms, an aromatic alcohol, and a terpene.
Claim 5
Dependent Claim
20 words
The composition of claim 3, wherein said solvent is selected from the group consisting of 2-ethylhexanol-1, α-terpineol, and benzyl alcohol.
Claim 6
Dependent Claim
26 words
The composition of claim 1, wherein the amount of anhydride is in the range of about 0.07% to about 6.75% by weight of the total composition.
Claim 7
Dependent Claim
27 words
The composition of claim 1, wherein said anhydride is selected from the group of acetic anhydride, propanoic anhydride, butanoic anhydride, pentanoic anhydride, hexanoic anhydride and benzoic anhydride.
Claim 8
Dependent Claim
39 words
The composition of claim 1, wherein the metal alkoxide is formed from a mixture of a metal halide and an alcohol, said ratio of metal halide to alcohol in said mixture being about 1/1 to about 1/3 by weight.
Claim 9
Dependent Claim
25 words
The composition of claim 7, wherein said metal halide is metal chloride and wherein said ratio of metal chloride to alcohol is 1/2 by weight.
Claim 10
Dependent Claim
47 words
The composition of claim 1, wherein the ratio of thickening or suspension agent to alcohol is about 2/1 to 20/1 by weight, and wherein the ratio of both said thickening or suspension agent and said alcohol to said metal alkoxide is about 10/1 to 50/1 by weight.
Claim 11
Dependent Claim
23 words
The composition of claim 1, wherein the alkoxide is selected from the group consisting of methoxide, ethoxide, n-propoxide, isopropoxide, butoxide, phenoxide and pentyloxide.
References Cited (Backward Citations)
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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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |