US3756991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of vinyl chloride with n substituted maleimides
Assignee: Hoechst AG
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Filing: 1971-01-27
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Granted: 1973-09-04
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Expires: 1991-01-27
Abstract
Abstract A PROCESS FOR PRODUCING COPOLYMERS OF VINYL CHLORIDE AND MALEIC ACID IMIDES SUBSTITUTED AT THE NITROGEN ATOM, SAID COPOLYMERS BEING OBTAINED BY CONTAINING THE VINYL CHLORIDE WITH ABOUT 1-15% BY MONOMER WEIGHT OF A MALEIC ACID IMIDE, TO OBTAIN A COPOLYMER HAVING IMPROVED DIMENSIONAL STABILITY UNDER HEAT.
Inventors
- 👤 G Kuehne
- 👤 A Neumaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:38
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F22/00; C08F22/36
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |