Patent US2756196A successfully refreshed from Google Patents.
US2756196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining lubricating oils
Assignee: Shell Development Co
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Filing: 1952-12-08
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Granted: 1956-07-24
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Expires: 1972-12-08
Abstract
No abstract record available.
Inventors
- 👤 Albert G Uzzell
- 👤 Howard M Lurton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:36
CPC Classifications
C; C10; C10G; C10G25/00; C10G71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD OF PRODUCING A REFINED LUBRICATING OIL OF IMPROVED OXIDATION STATBILITY WHICH COMPRISES CONTACTING A SELECTIVE SOLVENT REFINED RAFFINATE LUBRICATING OIL FRACTION HAVING A VISCOSITY AT 100* F. WITHIN THE RANGE OF FROM ABOUT 50 TO ABOUT 300 SAYBOLT UNIVERSAL SECONDS AND A FLASH POINT OF FROM ABOUT 305* F. TO ABOUT 445* F. WITH FROM ABOUT 5% TO ABOUT 10% BY WEIGHT, BASED ON THE OIL, OF A SOLID ADSORBENT CONSISTING ESSENTIALLY OF ACID ACTIVATED BENTONITE AT A TEMPERTURE SUBSTANTIALLY ABOVE THE FLASH POINT OF THE LUBRICATING OIL FRACTION AND EXPRESSED BY THE FOLLOWING EQUATION:
Claim 2
Independent Claim
97 words
A METHOD OF PRODUCING A REFINED LUBRICATING OIL OF IMPROVED OXIDATION STATBILITY WHICH COMPRISES CONTACTING A SELECTIVE SOLVENT REFINED RAFFINATE LUBRICATING OIL FRACTION HAVING A VISCOSITY AT 100* F. WITHIN THE RANGE OF FROM ABOUT 50 TO ABOUT 300 SAYBOLT UNIVERSAL SECONDS AND A FLASH POINT OF FROM ABOUT 305* F. TO ABOUT 445* F. WITH FROM ABOUT 5% TO ABOUT 10% BY WEIGHT, BASED ON THE OIL, OF A SOLID ADSORBENT CONSISTING ESSENTIALLY OF ACID ACTIVATED BENTONITE AT A TEMPERTURE SUBSTANTIALLY ABOVE THE FLASH POINT OF THE LUBRICATING OIL FRACTION AND EXPRESSED BY THE FOLLOWING EQUATION:
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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) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |