US3794580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocracking process
Assignee: Shell USA Inc
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Filing: 1973-02-26
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Granted: 1974-02-26
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Expires: 1993-02-26
Abstract
Abstract A CATALYTIC HYDROCRACKING PROCESS FOR PRODUCING HIGH VISCOSITY INDEX LUBRICATING OILS BY CONTACTING A MIXTURE OF HEAVY HYDROCARBONS HAVING A NITROGEN CONTENT LESS THAN 3000 P.P.M.W. WITH A CATALYST IN THE PRESENCE OF HYDROGEN UNDER HYDROCRACKING CONDITIONS AND ADDING TO SAID MIXTURE OF HYDROCARBONS UP TO ABOUT 300 P.P.M.W OF AMMONIA OR A NITROGEN COMPOUND WHICH YIELDS AMMONIA UNDER THE CONDITIONS OF THE PROCESS.
Inventors
- 👤 P Ladeur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:38
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J37/02; B01J37/0201; B01J37/20; C; C10; C10G; 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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |