US3655631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerisation process
Assignee: Evonik LIL Ltd
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Filing: 1969-11-17
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Granted: 1972-04-11
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Expires: 1989-11-17
Abstract
Abstract DELTA, EPSILON, AND ZETA LACTONES ARE POLYMERIZED IN THE PRESENCE OF STRONG ORGANIC ACIDS SUCH AS HALOGEN ACTIVATED CARBOXYLIC ACIDS OR SULFONIC ACIDS AS CATALYST AND COMPOUNDS OF THE FORMULA L-CH2OH AS INITIATOR WHEREIN L CONTAINS ETHYLENIC UNSATURATION ACTIVATED BY AMIDE OR ESTER LINKAGES. THE RESULTING TERMINALLY UNSATURATED POLYLACTONES ARE SUITABLE FOR COPOLYMERIZATION WITH ETHYLENICALLY UNSATURATED MONOMERS.
Inventors
- 👤 James R Fraser
- 👤 Victor F Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823; C08G63/02; C08G63/06; C08G63/08
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |