US3741916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for polymerization of epoxides
Assignee: Japanese Geon Co Ltd
•
Filing: 1965-12-20
•
Granted: 1973-06-26
•
Expires: 1985-12-20
Abstract
Abstract A METHOD FOR POLYMERIZING OR COPOLYMERIZING AN OLEFIN OXIDE MONOMER HAVING A 3-MEMBERED CYCLIC ETHER GROUP IN THE PRESENCE OF A CATALYST SYSTEM COMPOSED OF AN ORGANOALUMINUM COMPOUND REPRESENTED BY THE GENERAL FORMULA ALXNR3-N (WHEREIN X STANDS FOR A HALOGEN ATOM, R STANDS FOR AN ALKYL GROUP HAVING 1-6 CARBON ATOMS AND N STANDS FOR A NUMBER OF 0-2), AN ORGANIC ACID SALT OF A TRANSISTION ELEMENT, WHICH FURTHERMORE OPTIONALLY CONTAINS WATER AND/OR A NON-CYCLIC HALOGENATED ETHER.
Inventors
- 👤 H Asai
- 👤 R Yoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:43
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |