US3591533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamide foams
Assignee: Bayer AG
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Filing: 1967-07-19
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Granted: 1971-07-06
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Expires: 1987-07-19
Abstract
Abstract THE INVENTION RELATES TO THE PRODUCTION OF POLYAMIDE FOAMS FROM THE POLYMERIZATION OF LACTAMS IN THE PRESENCE OF AN ORGANIC ISOCYANATE AND A METAL BOROHYDRIDE.
Inventors
- 👤 Hermann Schnell
- 👤 Heinrich Gilch
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; C08J9/06; C08J9/08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; C08J2377/00; C08J2377/02
Claims Analysis
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |