Patent US4217232A successfully refreshed from Google Patents.
US4217232A
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Antioxidant compositions
Assignee: Mobil Oil AS
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Filing: 1978-12-21
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Granted: 1980-08-12
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Expires: 1998-12-21
Abstract
Abstract Compositions having highly effective antioxidant characteristics are provided comprising organic media, normally susceptible to oxidation, such as oils of lubricating viscosity, containing a minor amount sufficient to impart antioxidant properties thereto of the reaction product of a polysulfide and a hydrocarbylmagnesium halide or a Grignard reagent.
Inventors
- 👤 Milton Braid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:22
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/20; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/028; C10M2207/00; C10M2207/04; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2215/00; C10M2215/10; C10M2215/102; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10M2221/00; C10M2221/02; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2227/00; C10M2227/02; C10M2227/08; C10M2227/081; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A composition comprising a major proportion of an oil of lubricating viscosity or grease prepared therefrom and a minor proportion sufficient to impart antioxidant properties thereto of material soluble therein consisting of the reaction product of a polydisulfide having at least one unit with the following structure: ##STR4## where n is from about 2 to 20 and R and R 1 are hydrogen or C 1 -C 10 alkyl and a hydrocarbylmagnesium halide compound having the following structure: RMgX where R is alkyl, cycloalkyl or aryl having from 1 to about 30 carbon atoms and X is a halide.
Claim 2
Dependent Claim
99 words
A composition comprising a major proportion of an oil of lubricating viscosity or grease prepared therefrom and a minor proportion sufficient to impart antioxidant properties thereto of material soluble therein consisting of the reaction product of a polydisulfide having at least one unit with the following structure: ##STR4## where n is from about 2 to 20 and R and R 1 are hydrogen or C 1 -C 10 alkyl and a hydrocarbylmagnesium halide compound having the following structure: RMgX where R is alkyl, cycloalkyl or aryl having from 1 to about 30 carbon atoms and X is a halide.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein the polydisulfide is a cyclic or open-chain polydisulfide.
Claim 4
Dependent Claim
12 words
The composition of claim 2 wherein said polydisulfide is a cyclic polydisulfide.
Claim 5
Dependent Claim
14 words
The composition of claim 3 wherein said cyclic polydisulfide has the following structure: ##STR5##
Claim 6
Dependent Claim
29 words
The composition of claims 1, 2, 3 or 4 wherein X in said compound having the structure RMgX is selected from the group consisting of bromide, chloride or iodide.
Claim 7
Dependent Claim
20 words
The composition of claim 5 wherein X is bromide and R is aryl in said compound having the structure RMgX.
Claim 8
Dependent Claim
10 words
The composition of claim 6 wherein RMgX is phenylmagnesium bromide.
Claim 9
Dependent Claim
32 words
The composition of claim 1 wherein said oil of lubricating viscosity is selected from the group consisting of power steering fluids, automatic transmission fluids, brake fluids, power brake fluids and hydraulic fluids.
Claim 10
Dependent Claim
15 words
The composition of claim 8 wherein said oil of lubricating viscosity is a hydraulic fluid.
Claim 11
Dependent Claim
14 words
The composition of claims 1 or 8 wherein said oil is a mineral oil.
Claim 12
Dependent Claim
14 words
The composition of claims 1 or 8 wherein said oil is a synthetic oil.
Claim 13
Dependent Claim
17 words
The composition of claim 1 wherein said polydisulfide is 1,1,5,5,9,9,13,13-octamethyl-3,4,7,8,11,12,15,16-octathiacyclohexadecane and said hydrocarbylmagnesium halide is phenylmagnesium bromide.
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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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |