US3830723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing hvi lubricating oil by hydrocracking a wax
Assignee: Shell USA Inc
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Filing: 1973-03-21
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Granted: 1974-08-20
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Expires: 1993-03-21
Abstract
Abstract A LUBRICATING OIL MEETING THA SAE-10W/30 SPECIFICATION IS PREPARED FROM WAX OBTAINED FROM A DE-ASPHALTED RESIDUAL MINERAL OIL FRACTION BY HYDROCRACKING AT 325425*C. OVER A FLUORINE-CONTAINING ALUMINA-SUPPORTED MIXED SULFIDE CATALYST TO GIVE A LIQUID PRODUCT CONTAINING 25-85% WT. MATERIAL BOILING ABOVE 400*C., ISOLATING A RESIDUAL FRACTION HAVING AN INITIAL BOILING POINT BETWEEN 350 AND 470*C., AND DEWAXING THAT FRACTION.
Inventors
- 👤 P Ladeur
- 👤 Gooswilligen G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:26
CPC Classifications
C; C10; C10G; C10G21/00; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J37/00; B01J37/20; C10G47/00
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |