Patent US3682813A successfully refreshed from Google Patents.
US3682813A
Expired / Lapsed
US
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Multizone hydrocracking process for hvi lubricating oils
Assignee: Shell USA Inc
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Filing: 1970-05-20
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Granted: 1972-08-08
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Expires: 1990-05-20
Abstract
Abstract HIGH VISCOSITY INDEX LUBRICATING BASE OILS ARE PRODUCED FROM A DEASPHALTED OIL IN A MULTIZONE HYDROCRACKING PROCESS IN WHICH A SULFIDED NONACIDIC CATALYST COMPRISING ONE OR MORE METALS OF THE GROUP VI-B, VVII-B OR VIII METALS IS USED IN EACH REACTION ZONE. PREFERABLY, HYDROGEN SULFIDE AND/OR AMMONIA ARE REMOVED FROM THE FIRSTZONE EFFLUENT BEFORE INTRODUCING IT INTO THE SECOND ZONE. THE FIRST REACTION ZONE TEMPERATURE IS AT LEAST 750*F. WHILE THE SECOND REACTION ZONE TEMPERATURE IS AT LEAST 700*F.
Inventors
- 👤 Peter W Dun
- 👤 Pieter A Van Weeren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:31
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04; C10G65/08; C10G2400/00; C10G2400/10
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |