US3595812A
Expired / Lapsed
US
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Cationic polymerization of cyclic ethers
Assignee: BP Chemicals Ltd
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Filing: 1966-08-11
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Granted: 1971-07-27
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Expires: 1986-08-11
Abstract
Abstract CARBONIUM AND OXONIUM HEXAFLUORO PHOSPHATE COMPOUNDS ARE USED AS CATALYSTS IN THE POLYMERIZATION OF MONOMERIC MATERIALS SUCH AS CYCLIC ETHERS, FORMALS, ACETALS, N-ARYLIMINO COMPOUNDS, ALKYL VINYL ETHERS, AROMATIC VINYL COMPOUNDS AND ALKENES.
Inventors
- 👤 Jeffrey John Kendall Boulton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:59
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08F; C08F4/00; C08G2/18; C08G4/00; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/16; C08G71/00; C08G73/00
Claims Analysis
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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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |