Patent US3661855A successfully refreshed from Google Patents.
US3661855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linkable acetaldehyde co-polymers
Assignee: Orkem SA
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Filing: 1969-09-02
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Granted: 1972-05-09
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Expires: 1989-09-02
Abstract
Abstract CROSS-LINKABLE ELASTOMER CO-POLYMERS OF ACETALDEHYDE WITH A MONOMER COMPOUND POSSESSING AT THE SAME TIME AN EPOXY FUNCTION FIXED ON TWO VICINAL CARBON ATOMS OF A SATURATED HYDROCARBON CYCLE AND AN EPOXY FUNCTION FIXED ON TWO VICINAL ALIPHATIC CARBON ATOMS, THE SAID CO-POLYMERS HAVING AN ABSORPTION BAND FOR INFRA-RED AT 4520 CM-1 WHICH IS CHARACTERISTIC OF A FREE EPOXY FUNCTION. THE METHOD OF MANUFACTURE OF SAID ELASTOMER COPOLYMERS COMPRISES THE POLYMERIZATION OF ACETALDEHYDE WITH SAID MONOMER COMPOUND BY MEANS OF LEWIS ACID CATALYST AT A TEMPERATURE LOWER THAN -40*C.
Inventors
- 👤 Georges Ivanovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/12; C08G2/18; C08G2/22
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |