US2889262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of higher quality lubricating oil stocks
Assignee: Pure Oil Co
•
Filing: 1955-09-19
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Granted: 1959-06-02
•
Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Charles A Porter
- 👤 Donald G Samuelson
- 👤 Le Roy W Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE METHOD OF PRODUCING LIBRICATING OIL FRACTIONS OF HIGH VISCOSITY AND HIGH VISCOSITY INDEX, LIGHTER COLOR, HIGHER FLASH POINT, LOW CARBON RESIDUE, AND NARROW BOILING RANGE FROM PETROLEUM COMPRISING REMOVING DISTILLABLE MATERIALS UNDER REDUCED PRESSURE TO PRODUCE HEAVY RESIDUA HAVING SUS VISCOSITIES BETWEEN ABOUT 1800 AND 5000 SUS, SUBJECTING SAID HEAVY RESIDUA TO MILD DEASPHALTING USING A PROPANE TO-OIL RATIO OF ABOUT 8/1 AD AN OVERHEAD TEMPERAURE OF ABOUT 160*F. AT 445 P.S.I.G., AND FURTGHER PROCESSING THE DEASPHALTED OIL BY EXTRACTING DEWAXING AND CLAY CONTACTING UNDER CONDITIONS TO PRODUCE A FINISHED BRIGHT STOCK HAVING A VISCOSITY AT 210*F. OF ABOUT 120 TO 180 SUS.
Claim 2
Independent Claim
104 words
THE METHOD OF PRODUCING LIBRICATING OIL FRACTIONS OF HIGH VISCOSITY AND HIGH VISCOSITY INDEX, LIGHTER COLOR, HIGHER FLASH POINT, LOW CARBON RESIDUE, AND NARROW BOILING RANGE FROM PETROLEUM COMPRISING REMOVING DISTILLABLE MATERIALS UNDER REDUCED PRESSURE TO PRODUCE HEAVY RESIDUA HAVING SUS VISCOSITIES BETWEEN ABOUT 1800 AND 5000 SUS, SUBJECTING SAID HEAVY RESIDUA TO MILD DEASPHALTING USING A PROPANE TO-OIL RATIO OF ABOUT 8/1 AD AN OVERHEAD TEMPERAURE OF ABOUT 160*F. AT 445 P.S.I.G., AND FURTGHER PROCESSING THE DEASPHALTED OIL BY EXTRACTING DEWAXING AND CLAY CONTACTING UNDER CONDITIONS TO PRODUCE A FINISHED BRIGHT STOCK HAVING A VISCOSITY AT 210*F. OF ABOUT 120 TO 180 SUS.
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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) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |