US3629150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making isobutene polymerization catalyst from silica aluminum alkyl and a halide
Assignee: BP Chemicals Ltd
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Filing: 1969-06-02
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Granted: 1971-12-21
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Expires: 1989-06-02
Abstract
Abstract CATALYSTS SUITABLE FOR POLYMERIZING ISOBUTENE ARE MADE BY REACTING, UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, DEHYDRATED SILICA HAVING SILANOL GROUPS WITH ALUMINIUM ALKYL, AND THEN WITH A HYDROGEN HALIDE OR AN ALKYHALIDE.
Inventors
- 👤 Leslie Ernest Addy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:14
CPC Classifications
C; C08; C08F; C08F10/00
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |