US3704315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialkylsalicylic acids and alkaline earth metal salts thereof
Assignee: Shell USA Inc
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Filing: 1969-12-17
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Granted: 1972-11-28
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Expires: 1989-12-17
Abstract
Abstract ALKYLSALICYLIC ACIDS HAVING A HIGH DEGREE OF PARA-SUBSTITUTION AND HAVING THE ALKYL GROUP ATTACHED TO THE BENZENE NUCLEUS BY A QUATERNARY CARBON ATOM ARE PREPARED FROM TERTIARY ALKYLATING AGENTS AND IN PRATICULAR BY A TWO STAGE ALKYLATION OF PHENOL USING A STRAIGHT CHAIN MONOOLEFIN IN THE FIRST STAGE AND A BRANCHED MONOOLEFIN IN THE SECOND STAGE. THE POLYVALENT METAL SALTS OF SAID ACIDS ARE EXCELLENT LUBRICANT AND FUEL ADDITIVES CHARACTERIZED BY IMPROVED HIGH TEMPERATURE PERFORMANCE, THE ABILITY TO KEEP THE INTERIOR OF ENGINE CYLINDERS CLEAN AND TO COUNTERACT DEPOSITION OF CARBONACEOUS MATTER ON PISTONS AND PISTON RING GROOVES.
Inventors
- 👤 Aart Strang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:15
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C07; C07C; C07C37/00; C07C37/11; C07C37/14; C07C51/00; C07C51/15; C07C65/00; C07C65/01; C07C65/03; C07C65/05; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/188; C10L1/189; C10M2207/00; C10M2207/10; C10M2207/14; C10M2207/144; C10M2207/146; C10M2207/26; C10M2207/262; C10M2207/40; C10M2207/404; C10N; C10N2050/00; C10N2050/10; C10N2070/00; C10N2070/02
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |