US3795616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear stable,multiviscosity grade lubricating oils
Assignee: Gulf Research and Development Co
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Filing: 1972-04-18
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Granted: 1974-03-05
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Expires: 1992-04-18
Abstract
Abstract COMPOUNDED LUBRICATING OILS HAVING IMPROVED PROPERTIES, INCLUDING VISCOSITY PROPERTIES, ARE OBTAINED BY THE USE OF HIGHER ALPHA-OLEFIN POLYMERS OF CONTROLLED MOLECULAR SIZE AND NARROW MOLECULAR WEIGHT DISTRIBUTION. A SHEAR STABLE, MULTIVISCOSITY GRADE LUBRICATING OIL IS PRODUCED BY ADDING THE ALPHA-OLEFIN POLYMER TO A LUBRICATING OIL.
Inventors
- 👤 W Heilman
- 👤 T Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:28
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/08; C08; C08F; C08F10/00; C08F10/14; C10M2205/00; C10M2205/02; C10M2205/028; C10N; C10N2020/00; C10N2020/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |