Patent JPS5210658A successfully refreshed from Google Patents.
Patent US3679613A successfully refreshed from Google Patents.
US3679613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamide foams
Assignee: Bayer AG
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Filing: 1970-03-17
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Granted: 1972-07-25
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Expires: 1990-03-17
Abstract
Abstract A PROCESS OF PREPARING POLYAMIDE FOAMS BY HEATING A LACTAM OR A MIXTURE OF LACTAMS HAVING AT LEAST 7 RING MEMBERS WITH AT LEAST ONE MOLE PERCENT OF AN ORGANIC ISOCYANATE OR MASKED ISOCYANATE AT A TEMPERATURE ABOVE 130*C. IN THE PRESENCE OF AN ALKALI METAL OR ALKALINE EARTH METAL COMPOUND WHEREIN THE MOLE RADIO OF ISOCYANATE TO METAL COMPOUND IS GREATER THAN 5:1.
Inventors
- 👤 Heinrich Gilch
- 👤 Hermann Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:21
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; C08J2377/00; C08J2377/02
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |