US3585257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process for preparing block copolymers
Assignee: Phillips Petroleum Co
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Filing: 1967-11-02
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Granted: 1971-06-15
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Expires: 1987-11-02
Abstract
Abstract A COPLOYMER IS FORMED BY PROVIDING A POLYMER HAVING AT LEAST ONE >C(-)-M GROUP WHEREIN M IS AN ALKALI METAL SUCH AS LITHIUM, REACTING THE POLYMER WITH AN ALKENE OXIDE SUCH AS EHTYLENE OXIDE AND CONTACTING THE REACTION PRODUCT THEREOF WITH AT LEAST ONE LACTONE SUCH AS EPSILON-CAPROLACTONE TO POLYMERIZE THE LACTONE AND FORM A LACTONE POLYMER BLOCK ON THE FIRST PROVIDED POLYMER.
Inventors
- 👤 Francis X Mueller Jr
- 👤 Henry L Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:14
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/38; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08G65/00; C08G65/02; C08G65/26
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |