US3682847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamide foam
Assignee: Bayer AG
•
Filing: 1969-12-17
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Granted: 1972-08-08
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Expires: 1989-12-17
Abstract
Abstract PROCESS FOR THE PRODUCTION OF POLYAMIDE FOAM BY DISSOLVING UNDER PRESSURE A GAS IN A POLYMERISABLE MIXTURE OF A LACTAM, A BASIC CATALYST AND AN ACTIVATOR, HEATING THIS REACTION MASS TO POLYMERISATION TEMPERATURE, RELEASING THE PRESSURE OF THE REACTION MASS, AND THEREAFTER FINALLY POLYMERISING THE REACTION MASS IN A MOULD.
Inventors
- 👤 Heinrich Gilch
- 👤 Walter Damsky
- 👤 Klaus Reinking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08J2377/00; C08J2377/02; Y; Y10; Y10S; Y10S264/00; Y10S264/56; Y10S521/00; Y10S521/901
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |