Patent US2500762A successfully refreshed from Google Patents.
US2500762A
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Lubricant composition
Assignee: Standard Oil Development Co
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Filing: 1947-01-02
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Granted: 1950-03-14
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Expires: 1967-01-02
Abstract
No abstract record available.
Inventors
- 👤 Lieber Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:39
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/52; C10M2223/00; C10M2223/06; C10M2223/061; C10M2225/00; C10M2225/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
PRODUCT CONSISTING ESSENTIALLY OF A HIGH MOLECULAR WEIGHT POLYMERIC CONDENSATION PRODUCT OF 0.5 TO 10 MOLS OF AN ALKYLATED AROMATIC COMPOUND WITH 1 MOL OF A PHOSPHORUS HALIDE, SAID PRODUCT BEING SUBSTANTIALLY NON-VOLATILE AT ALL TEMPERATURES UP TO ABOUT 500*F. UNDER REDUCED PRESSURE WHEREIN THE CONDENSATION CATALYST CONSISTS ESSENTIALLY OF 0.2 TO 2.0 MOLS OF A FRIEDELCRAFTS CATALYST PER MOL OF PHOSPHORUS HALIDE.
Claim 2
Dependent Claim
72 words
A LUBRICANT CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF A WAXY MINERAL LUBRICATING OIL, CONTAINING DISSOLVED THEREIN A SMALL BUT POURDEPRESSING AMOUNT OF A CONDENSATION PRODUCT OF 0.5 TO 10 MOLS OF AMYL NAPHTHALENE AND 1 MOL OF PHOSPHORUS TRICHLORIDE, SAID CONDENSATION PRODUCT BEING SUBSTIALLY NON-VOLATILE AT ALL TEMPERATURES UP TO ABOUT 500*F. UNDER A PRESSURE OF 1 TO 50 MILLIMETERS ABSOLUTE AND HAVING BEEN MADE BY THE PROCESS OF CLAIM 4.
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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |