Patent US4287003A successfully refreshed from Google Patents.
US4287003A
Expired / Lapsed
US
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Stabilization of chlorinated aliphatic hydrocarbons
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-07-18
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Granted: 1981-09-01
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Expires: 1999-07-18
Abstract
Abstract Trichloroethylene, perchloroethylene or methylene dichloride is stabilized with an epoxy alkyl ester which is derived from a carboxylic acid containing from 5 to 22 carbon atoms and from an alcohol containing from 3 to 12 carbon atoms.
Inventors
- 👤 Christopher S. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:18
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02854; C23G5/02861; C23G5/0288; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A method of degreasing metal and other articles which comprises bringing the articles into contact with a solvent selected from the group consisting of trichloroethylene, perchloroethylene and methylene chloride in the vapor phase wherein said solvent has been stabilized with a stabilizing amount of an epoxy alkyl ester which is derived from a carboxylic acid containing 5 to 22 carbon atoms and from an alcohol containing 3 to 12 carbon atoms.
Claim 2
Independent Claim
71 words
A method of degreasing metal and other articles which comprises bringing the articles into contact with a solvent selected from the group consisting of trichloroethylene, perchloroethylene and methylene chloride in the vapor phase wherein said solvent has been stabilized with a stabilizing amount of an epoxy alkyl ester which is derived from a carboxylic acid containing 5 to 22 carbon atoms and from an alcohol containing 3 to 12 carbon atoms.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein said solvent further contains a conventional stabilizer.
Claim 4
Dependent Claim
21 words
A method as claimed in claim 1 wherein the ester is derived from an acid containing 12 to 20 carbon atoms.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 1 or claim 3 wherein the ester is derived from an alcohol containing from 3 to 8 carbon atoms.
Claim 6
Dependent Claim
38 words
A method as claimed in claim 1 in which the ester is derived from a carboxylic acid containing an n-alkyl, iso-alkyl or cyclo-alkyl group and from an alcohol containing an n-alkyl, iso-alkyl, alkenyl, cyclo-alkyl group or a polyol.
Claim 7
Dependent Claim
32 words
A method as claimed in claim 1 or claim 5 in which the stabilizer for the solvent is a mixture of epoxy alkyl esters derived from long chain fatty acids and glycerol.
Claim 8
Dependent Claim
19 words
A method as claimed in claim 6 in which the stabilizer for the solvent is an epoxidized vegetable oil.
Claim 9
Dependent Claim
20 words
A method as claimed in claim 7 in which the stabilizer for the solvent is an epoxidized soya bean oil.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 7 in which the stabilizer for the solvent is an epoxidized linseed oil.
Claim 11
Dependent Claim
30 words
A method as claimed in claim 5 in which the proportion by weight of epoxy alkyl ester is about 0.05% to about 5% by weight with reference to the solvent.
Claim 12
Dependent Claim
16 words
A method as claimed in claim 1 or claim 5 in which the solvent is trichloroethylene.
Claim 13
Dependent Claim
39 words
A method as claimed in claim 11 in which there is also incorporated in the solvent a stabilizing amount of one of more of the following conventional stabilizers therefor: phenols, amines, aliphatic monoketones, nitroalkanes, pyrolle derivatives and olefinic hydrocarbons.
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |