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US3625854A
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Oven-cleaning composition
Assignee: Sinclair Research Inc
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Filing: 1968-05-10
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Granted: 1971-12-07
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Expires: 1988-05-10
Abstract
Abstract An oven-cleaning composition comprising about 2 to 30 weight percent of an alkali metal or ammonium salt of a copolymer of styrene and maleic anyhdride, the copolymer of styrene and maleic anhydride having a molecular weight of about 500 to 50,000 and a molar ratio of styrene to maleic anhydride of about 1:1 to 4:1; about 1 to 10 weight percent of a caustic material which can be an alkali metal oxide or hydroxide, an alkali metal silicate, or an alkanol amine; and about 60 to 97 weight percent water.
Inventors
- 👤 Bob G Gower
- 👤 Hector J Gonzalez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:25
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3765
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
32 words
The composition of claim 1 wherein said copolymer of styrene and maleic anhydride has a molecular weight of about 1,650 and a molar ratio of styrene to maleic anhydride of about 2:1.
Claim 2
Dependent Claim
126 words
An oven-cleaning composition consisting essentially of: about 8 to 25 weight percent of an ammonium salt of a copolymer of styrene and maleic anhydride said copolymer of styrene and maleic anhydride having a molecular weight of about 500 to 3, 000 and a molar ratio of styrene to maleic anhydride of about 1:1 to 3:1; about 1 to 10 weight percent based on the sodium silicate solids of an aqueous solution of sodium silicate said solution having a viscosity of about 60 to 70,000 centipoises at 25* C. and containing about 6 to 20 weight percent Na2O, about 15 to 40 weight percent SiO2, and having a weight ratio of SiO2 to Na2O of about 1.6:1 to 3.8:1.; and about 70 to 90 weight percent water.
Claim 3
Dependent Claim
25 words
The composition of claim 3 wherein the aqueous solution of sodium silicate is about 2 to 7 weight percent based on the sodium silicate solids.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the alkanol amine is ethanol amine.
Claim 5
Dependent Claim
37 words
The composition of claim 1 wherein said copolymer of styrene and maleic anhydride have a molecular weight of about 500 to 3, 000 and a molar ratio of styrene to maleic anhydride of about 1:1 to 3:1.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |