Patent US4723578A successfully refreshed from Google Patents.
US3585168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing copolymer of epoxide and carbon dioxide
Assignee: Individual
•
Filing: 1969-08-15
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Granted: 1971-06-15
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Expires: 1989-08-15
Abstract
Abstract A PROCESS FOR PRODUCING HIGH MOLECULAR WEIGHT COPOLYMERS OF AN EPOXIDE, SUCH AS PROPYLENE OXIDE, ETHYLENE OXIDE, STYRENE OXIDE, ISOBUTYLENE OXIDE OR EPICHLOROHYDRIN, AND CARBON DIOXIDE, WHEREIN THE COPOLYMERIZATION REACTION OCCURS UNDER THE PRESSURE OF CARBON DIOXIDE GAS AND IN THE PRESENCE OF AN ORGANOMETALLIC COMPOUND AS A CATALYST.
Inventors
- 👤 Shohei Inoue
- 👤 Hideomi Koinuma
- 👤 Teiji Tsuruta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:17
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/02; C08G64/0208; C08G64/16; C08G64/1608; C08G64/18; C08G64/183; C08G64/20; C08G64/32; C08G64/34
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 |