US3489692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of catalysts
Assignee: BP PLC
•
Filing: 1967-08-11
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Granted: 1970-01-13
•
Expires: 1987-08-11
Abstract
No abstract record available.
Inventors
- 👤 Kenneth Hugh Bourne
- 👤 John Stanley Elkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:18
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/76; B01J23/84; B01J23/889; B01J23/8896; B01J23/89
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2955090A
Cited
US3143511A
Cited
US3389965A
Cited
US3293170A
Cited
US3205178A
Cited
US3371050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |