Patent US3578642A successfully refreshed from Google Patents.
US3578642A
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Polymerization of alkene oxides with an organoalkaline earth complex and an organoaluminum catalyst system
Assignee: Phillips Petroleum Co
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Filing: 1968-12-18
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Granted: 1971-05-11
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Expires: 1988-12-18
Abstract
Abstract ALKENE OXIDES ARE POLYMERIZED ALONE OR COPOLYMERIZED WITH ACRYLIC ACID ESTERS, METHACRYLIC ACID ESTERS, LACTONES, OR OTHER ALKENE OXIDES IN THE PRESENCE OF AN ORGANOALKALINE EARTH COMPOUND AND AN ORGANOALUMINUM COMPOUND.
Inventors
- 👤 Francis X Mueller Jr
- 👤 James D Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/42; C08G18/4266; C08G18/4269; C08G63/00; C08G63/78; C08G63/82; C08G63/823; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C08G65/26; C08G65/2642; C08G65/269
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |