Patent US3446730A successfully refreshed from Google Patents.
US3446730A
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Catalytic hydrodenitrogenation of petroleum fractions
Assignee: Gulf Research and Development Co
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Filing: 1966-06-21
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Granted: 1969-05-27
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Expires: 1986-06-21
Abstract
No abstract record available.
Inventors
- 👤 Bernard A Kerns
- 👤 Olaf A Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:38
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J21/00; B01J21/02; B01J21/04; B01J27/00; B01J27/14; B01J27/186; B01J27/188; C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3116233A
Cited
US3125510A
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US3188174A
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US3222273A
Cited
US3145160A
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US3277199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |