US3833618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-(high molecular weight alkyl-substituted carbophenoxy)phthalic anhydride and analogous diacid
Assignee: BP Corp North America Inc
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Filing: 1972-09-29
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Granted: 1974-09-03
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Expires: 1992-09-29
Abstract
Abstract TITLE COMPOUNDS ARE NOVEL OIL-SOLUBLE ANHYDRIDES AND THEIR ANALOGOUS DIACIDS. THE ANHYDRIDES ARE OBTAINED BY REACTION OF C30-214 ALKYL-SUBSTITUTED PHENOL WITH 4-ACID CHLORIDE OF TRIMELLITIC ANHYDRIDE WHICH CAN BE READILY HYDROLYZED WITH WATER TO THE ANALOGOUS DIACIDS. THE TITLE COMPOUNDS ARE USEFUL ANTI-RUST AND/OR ANTI-WEAR ADDITION AGENTS FOR LUBRICANTS AND AS INTERMEDIATE REACTANTS WITH ALCOHOLS AND AMINES FOR PREPARATION OF ESTER, AMIDE AND IMIDE DERIVATIVES ALSO USEFUL AS ADDITION AGENTS FOR LUBRICANTS, ESPECIALLY MINERAL OIL BASED LUBRICANTS.
Inventors
- 👤 E Piasek
- 👤 I Puskas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:17
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D307/00; C07D307/77; C07D307/87; C07D307/89; C10; C10M; C10M129/00; C10M129/86; C10M129/95; C10M133/00; C10M133/52
Claims Analysis
Total Claims: 0
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |