US3535232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of catalysts
Assignee: BP PLC
•
Filing: 1967-12-26
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Granted: 1970-10-20
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Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Paul Anthony Lawrance
- 👤 Robert William Aitken
- 👤 Alexander Porteous
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:42
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/38; B01J23/40; B01J23/70; B01J23/74; B01J23/755; B01J37/00; B01J37/02; B01J37/03; B01J37/031; B01J37/033; B01J37/30; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |