Patent US3204558A successfully refreshed from Google Patents.
Patent US3208943A successfully refreshed from Google Patents.
US3208943A
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Copolymers of alkenyl phosphorus esters as lubricating oil additives
Assignee: Shell USA Inc
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Filing: 1961-08-30
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Granted: 1965-09-28
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Expires: 1981-08-30
Abstract
No abstract record available.
Inventors
- 👤 Kirby Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:15
CPC Classifications
C; C08; C08L; C08L43/00; C08L43/02; C08F; C08F30/00; C08F30/02; C10; C10M; C10M153/00; C10M153/02; C10M2203/00; C10M2203/10; C10M2203/1006; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10M2225/00; C10M2225/02; C10N; C10N2030/00; C10N2030/02; C10N2030/04; C10N2030/06; C10N2040/00; C10N2040/06; C10N2040/12; C10N2040/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A MINERAL LUBRICATING OIL COMPOSITION COMPRISING A MAJOR AMOUNT OF MINERAL LUBRICATING OIL AND FROM ABOUT 0.01% TO ABOUT 20% OF AN OIL-SOLUBLE COPOLYMER OF TRIALLYL PHOSPHATE AND C8-20 ALKYL METHACRYLATE, IN THE MOL RATIO OF 1:20 TO 20:1, RESPECTIVELY, SAID COPOLYMER HAVING MOLECULAR WEIGHT OF FROM ABOUT 50,000 TO 1,000,000.
Claim 2
Dependent Claim
51 words
A MINERAL LUBRICATING OIL COMPOSITION COMPRISING A MAJOR AMOUNT OF MINERAL LUBRICATING OIL AND FROM ABOUT 0.01% TO ABOUT 20% OF AN OIL-SOLUBLE COPOLYMER OF TRIALLYL PHOSPHATE AND C8-20 ALKYL METHACRYLATE, IN THE MOL RATIO OF 1:20 TO 20:1, RESPECTIVELY, SAID COPOLYMER HAVING MOLECULAR WEIGHT OF FROM ABOUT 50,000 TO 1,000,000.
References Cited (Backward Citations)
US2577796A
Cited
US2659714A
Cited
US2694684A
Cited
US2711403A
Cited
US2867610A
Cited
US2956952A
Cited
US2863834A
Cited
US2940961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |