US3699079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon dioxide-diepoxide copolymers
Assignee: Shell USA Inc
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Filing: 1970-08-11
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Granted: 1972-10-17
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Expires: 1990-08-11
Abstract
Abstract A PROCESS FOR COPOLYMERIZING ONE OR MORE DIEPOXIDE COMPOUNDS WITH CARBON DIOXIDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A COMPOSITE CATALYST COMPRISING AN ORGANO-METALLIC COMPOUND OF MAGNESIUM, ZINC, OR CADMIUM, AND ONE OR MORE COMPOUNDS FROM THE GROUP OF POLAR ORGANIC NITRO-, NITROSO-, AZOXY, AMINE, THIOL AND SULFOXIDE COMPOUNDS AND WATER IS DISCLOSED. THE RESULTING PRODUCTS ARE USEFUL IN FILM AND MOULDINGS.
Inventors
- 👤 Peter Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:24
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/32; C08G64/34; C08G64/02; C08G64/0208; C08G64/16; C08G64/1608
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |