US2536685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic lubricant
Assignee: Shell Development Co
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Filing: 1947-06-02
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Granted: 1951-01-02
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Expires: 1967-06-02
Abstract
No abstract record available.
Inventors
- 👤 Harman Denham
- 👤 William E Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08G; C08G79/00; C08G79/02; C08G79/04; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/129; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/106; C10M2209/107; C10M2221/00; C10M2221/04; C10M2221/043; C10M2225/00; C10M2225/02; C10N; C10N2010/00; C10N2010/02; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AS AN EXTREME PRESSURE AGENT SUITABLE FOR IMPARTING EXTREME PRESSURE PROPERTIES TO OXYGEN-CONTAINING LUBRICATING OILS, THE REACTION PRODUCT OF A PROPYLENE OXIDE POLYMER WITH A PHOSPHORUS HALIDE, SAID PRODUCT HAVING BOTH PHOSPHORUS AND HALOGEN SUBSTITUENTS, THE COMPOSITION HAVING A PHOSPHORUS CONTENT OF 1-20% AND A CHLORINE CONTENT OF AT LEAST 1%, SAID REACTION PRODUCT BEING OBTAINED BY HEATING A PROPYLENE OXIDE POLYMER AND A PHOSPHORUS HALIDE AT A TEMPERATURE BETWEEN 50 AND 200* C.
Claim 2
Dependent Claim
74 words
AS AN EXTREME PRESSURE AGENT SUITABLE FOR IMPARTING EXTREME PRESSURE PROPERTIES TO OXYGEN-CONTAINING LUBRICATING OILS, THE REACTION PRODUCT OF A PROPYLENE OXIDE POLYMER WITH A PHOSPHORUS HALIDE, SAID PRODUCT HAVING BOTH PHOSPHORUS AND HALOGEN SUBSTITUENTS, THE COMPOSITION HAVING A PHOSPHORUS CONTENT OF 1-20% AND A CHLORINE CONTENT OF AT LEAST 1%, SAID REACTION PRODUCT BEING OBTAINED BY HEATING A PROPYLENE OXIDE POLYMER AND A PHOSPHORUS HALIDE AT A TEMPERATURE BETWEEN 50 AND 200* C.
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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |