US3657159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxide polymerization catalysts comprising complex organoaluminate compounds of silicon tin or phosphorus
Assignee: Hercules LLC
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Filing: 1970-08-27
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Granted: 1972-04-18
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Expires: 1990-08-27
Abstract
Abstract COMPLEX ORGANOALUMINATED COMPOUNDS OF SILICON, TIN AND PHOSPHORUS WHICH ARE PARTICULARLY USEFUL AS EPOXIDE POLYMERIZATION CATALYSTS ARE DESCIRBED. THESE COMPOUNDS CAN BE PREPARED BY REACTING A LITHIUM ORGANOALUMIATE WITH A HALOGEN-CONTAINING COMPOUND OF SILICON, TIN OR PHOSPHORUS, AS FOR EXAMPLE BY REACTING LITHIUM DIETHYLALUMINATE WITH DIMETHYLDICHLOROSILANE, STANNIC CHLORIDE, DICHLOROPHENYLPHOSPHIN OXIDE, ETC. OR BY REACTING A TRIALKYLALUMINUM SUCH AS TRIETHYLALUMINUM WITH DIMETHYLSILANEDIOL, METHYLPHOSPHORIC ACID, STANNIC HYDROXIDE, ETC.
Inventors
- 👤 Edwin J Vandenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:47
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0836; C07F7/22; C07F7/2224; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/095
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |