Patent US3702313A successfully refreshed from Google Patents.
US3702313A
Expired / Lapsed
US
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Process for the production of polyamide foams
Assignee: Bayer AG
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Filing: 1968-10-11
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Granted: 1972-11-07
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Expires: 1988-10-11
Abstract
Abstract IMPROVEMENT IN THE PROCESS FOR THE PRODUCTION OF POLYAMIDE FOAMS BY ACTIVATED IONIC POLYMERISATION OF LACTAMS, IN WHICH ORGANOSIOLOXANE-HYDROXYALKYLENE BLOCK COPOLYMERS ARE ADDED TO THE POLYMERISATION MIXTURE BEFORE POLYMERISATION IS STARTED.
Inventors
- 👤 Heinrich Gilch
- 👤 Kurt Schneider
- 👤 Hermann Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08J2377/00; C08J2377/02; C08J2483/00
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |