Patent US4207196A successfully refreshed from Google Patents.
US4207196A
Expired / Lapsed
US
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Stabilized compositions of polymers in oil
Assignee: Covestro International SA
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Filing: 1978-12-07
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Granted: 1980-06-10
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Expires: 1998-12-07
Abstract
Abstract Ethylene/α-olefin polymers dissolved in mineral base oils as lubricating oils and functional fluids that are subject to excessive temperatures and agitation have improved resistance to degradation of the polymer and decrease in viscosity when such compositions contain certain dialkyl dithiocarbamate salts and certain tetraalkyl thiuram sulfides.
Inventors
- 👤 John H. Sudekum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:39
CPC Classifications
C; C10; C10M; C10M161/00; C10M2205/00; C10M2205/10; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/064; C10M2219/066; C10M2219/068; C10N; C10N2010/00; C10N2010/02; C10N2010/08; C10N2010/12; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
An oil composition comprising a mineral base oil, a copolymer of ethylene and an α-olefin and a material selected from the group consisting of a stabilizing amount of a (1) metal salt of alkyl dithiocarbamate in which said metal is alkyl metal of group 1A, selenium or tellurium or (2) an alkyl thiuram sulfide.
Claim 2
Dependent Claim
54 words
An oil composition comprising a mineral base oil, a copolymer of ethylene and an α-olefin and a material selected from the group consisting of a stabilizing amount of a (1) metal salt of alkyl dithiocarbamate in which said metal is alkyl metal of group 1A, selenium or tellurium or (2) an alkyl thiuram sulfide.
Claim 3
Dependent Claim
11 words
A composition of claim 1 wherein (2) are tetraalkyl thiuram sulfides.
Claim 4
Dependent Claim
21 words
A composition of claim 1 wherein (1) is a sodium salt and the alkyl groups contain 1 to 6 carbon atoms.
Claim 5
Dependent Claim
24 words
A composition of claim 2 wherein (2) is a tetraalkyl thiuram sulfide or disulfide and the alkyl group contains 1 to 6 carbon atoms.
Claim 6
Dependent Claim
38 words
A composition of claim 3 wherein the copolymer is ethylene and propylene and (1) is present in amounts up to about 5 weight percent based on said copolymer, and the alkyl groups contain 1 to 2 carbon atoms.
Claim 7
Dependent Claim
38 words
A composition of claim 4 wherein the copolymer is ethylene and propylene and (2) is present in amounts up to about 5 weight percent based on said copolymer, and the alkyl groups contain 1 to 2 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |