Patent US4462918A successfully refreshed from Google Patents.
US4462918A
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Lubricating oil composition
Assignee: Shell USA Inc
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Filing: 1983-02-08
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Granted: 1984-07-31
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Expires: 2003-02-08
Abstract
Abstract A lubricating oil composition is disclosed which comprises a major proportion of a lubricating oil and a minor proportion of each of a Group II metal dithiophosphate and composition having the formula ##STR1## wherein R 1 , R 2 , R 5 , R 6 and R 7 each are hydrogen or hydrocarbon containing 1-30 carbon atoms, and wherein R 3 and R 4 are independently selected from hydrogen, hydrocarbon containing from 1 to 30 carbon atoms, and acyl containing from 1 to 30 carbon atoms.
Inventors
- 👤 Peter H. D. Matthews
- 👤 Derek W. Morecroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:29
CPC Classifications
C; C10; C10M; C10M141/00; C10M141/10; C10M133/00; C10M133/02; C10M133/04; C10M133/06; C10M133/16; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/12; C10M2215/122; C10M2215/24; C10M2215/26; C10M2215/28; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A lubricating oil composition comprising a major proportion of a lubricating oil and from 0.1 to 5 percent by weight of a Group II metal dithiophosphate and from 0.01 to 5 percent by weight of a compound having the formula ##STR3## wherein R 1 , R 2 , R 5 , R 6 and R 7 each are hydrogen or hydrocarbon containing 1 to 30 carbon atoms, and wherein R 3 and R 4 are independently selected from hydrogen, hydrocarbon containing from 1 to 30 carbon atoms, and acyl containing from 1 to 30 carbon atoms.
Claim 2
Dependent Claim
96 words
A lubricating oil composition comprising a major proportion of a lubricating oil and from 0.1 to 5 percent by weight of a Group II metal dithiophosphate and from 0.01 to 5 percent by weight of a compound having the formula ##STR3## wherein R 1 , R 2 , R 5 , R 6 and R 7 each are hydrogen or hydrocarbon containing 1 to 30 carbon atoms, and wherein R 3 and R 4 are independently selected from hydrogen, hydrocarbon containing from 1 to 30 carbon atoms, and acyl containing from 1 to 30 carbon atoms.
Claim 3
Dependent Claim
25 words
The composition of claim 1 in which R 1 and R 5 are the same or different straight-chain or branched-chain hydrocarbon containing 1-20 carbon atoms.
Claim 4
Dependent Claim
21 words
The composition of claim 2 in which R 1 and R 5 are saturated hydrocarbon containing 3 to 6 carbon atoms.
Claim 5
Dependent Claim
56 words
The composition of claim 1 in which R 1 and R 5 are the same or different alkyl containing 3 to 6 carbon atoms, R 2 is hydrogen, and R 3 and R 4 are independently selected from alkyl containing 15 to 20 carbon atoms or saturated or unsaturated acyl containing 2 to 10 carbon atoms.
Claim 6
Dependent Claim
27 words
The composition of claim 3 in which R 1 and R 5 are isobutyl, R 2 is hydrogen, R 3 is octadecyl, and R 4 is 3-carboxy-1-oxo-2-propenyl.
Claim 7
Dependent Claim
37 words
The composition of claims 1 through 5 in which the Group II metal dithiophosphate is a Group II metal dialkyl dithiophosphate in which the metal is selected from the group consisting of Zn, Mg, Ca and Ba.
Claim 8
Dependent Claim
28 words
The composition of claims 1 through 5 in which the Group II metal dithiophosphate is a zinc dialkyl dithiophosphate in which the alkyl groups contain 3-20 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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |