Patent US4120810A successfully refreshed from Google Patents.
US4120810A
Expired / Lapsed
US
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Paint remover with improved safety characteristics
Assignee: VP ACQUISITIONS Corp 3155 WEST BIG BEAVER ROAD SUITE 200 TROY MICHIGAN 48007-7026 A MICHIGAN CORP
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Filing: 1976-10-21
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Granted: 1978-10-17
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Expires: 1996-10-21
Abstract
Abstract A paint remover, with improved safety characteristics, has low toxicity, low volatility and does not burn the skin. It does not contain the toxic substances most commonly included in paint removers, primarily methanol, methylene chloride, and benzene. It is a mixture of a first chemical, preferably n-methyl 2-pyrrolidone, and a second chemical, preferably a mixture of aromatic hydrocarbons having more than six carbon atoms. This paint remover is effective on a wide range of surfaces and penetrates more layers of paint per application primarily because of its slow evaporation rate. Its fume levels are so low that it can be used safely indoors.
Inventors
- 👤 David A. Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:50
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5004; C11D7/5022; C09; C09D; C09D9/00; C09D9/005; C11D3/00; C11D3/43; C11D7/5013; C11D7/22; C11D7/24; C11D7/26; C11D7/267; C11D7/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A paint, varnish, and general coatings remover or deglosser with improved safety characteristics consisting essentially of a mixture of at least two chemicals, the first chemical making up approximately 15 to 60 mole percent of the mixture and being one or more of the chemicals selected from the group consisting of n-methyl 2-pyrrolidone, n-vinyl 2-pyrrolidone, and butyrolactone; and the second chemical making up at least 35 mole percent of the mixture and comprising blends of alkyl naphthalenes and alkyl benzenes which have a molar volume greater than or equal to about 140 cc/g mole.
Claim 2
Dependent Claim
94 words
A paint, varnish, and general coatings remover or deglosser with improved safety characteristics consisting essentially of a mixture of at least two chemicals, the first chemical making up approximately 15 to 60 mole percent of the mixture and being one or more of the chemicals selected from the group consisting of n-methyl 2-pyrrolidone, n-vinyl 2-pyrrolidone, and butyrolactone; and the second chemical making up at least 35 mole percent of the mixture and comprising blends of alkyl naphthalenes and alkyl benzenes which have a molar volume greater than or equal to about 140 cc/g mole.
Claim 3
Dependent Claim
76 words
The mixture of claim 1, said mixture further including a third chemical making up as much as approximately 50 mole percent of the mixture, said third chemical being selected from the group consisting of the high flash point glycol ethers polar solvents, acetophenone, ethanol, isopropanol, n-propanol, ketones having from 3 to 7 carbon atoms, and diketones having from 4 to 8 carbon atoms, and said third chemical having a melting point of 70° F. or lower.
Claim 4
Dependent Claim
30 words
The mixture of claim 1, further including a cellulose derivative thickener at a concentration up to about 6 weight percent of the mixture to increase the viscosity of the mixture.
Claim 5
Dependent Claim
17 words
The mixture of claim 1, further including a surfactant for enchancing the water washability of the mixture.
Claim 6
Dependent Claim
24 words
The mixture of claim 1, wherein said first chemical is n-methyl 2-pyrrolidone being present at a concentration of between 20 and 40 mole percent.
Claim 7
Dependent Claim
22 words
The mixture of claim 1, wherein said first chemical has a molar volume less than said molar volume of the second chemical.
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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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |