US3630905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-extended vi improvers
Assignee: Phillips Petroleum Co
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Filing: 1968-11-19
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Granted: 1971-12-28
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Expires: 1988-11-19
Abstract
Abstract AN OIL-EXTENDED VI IMPROVER WHICH BY OUTWARD APPEARANCE IS DRY COMPRISING (A) 40-60 WEIGHT PERCENT HYDROGENATED BUTADIENCE-STYRENE POLYMER AND (B) 60-40 WEIGHT PERCENT OF A PARAFFINC OIL. THE OIL-EXTENDED VI IMPROVER CAN BE READILY DISPERESED IN A LUBRICATING OIL FOLLOWING STORAGE AND/OR SHIPPING TO PLACE OF UTILIZATION.
Inventors
- 👤 Poznan M Sorgo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/104; C10M2203/106; C10M2203/108; C10M2205/00; C10M2205/06
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |