US3634345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic resins based on isocyanates
Assignee: Bayer AG
•
Filing: 1969-07-09
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Granted: 1972-01-11
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Expires: 1989-07-09
Abstract
Abstract A PROCESS IS PROVIDED FOR THE PRODUCTION OF SYNTHETIC RESINS BASED ON ISOCYANATES USING BASIC CATALYSTS WHEREIN COMPOUNDS HAVING MORE THAN ONE ISOCYANATE GROUP IN THE MOLECULE ARE POLYMERIZED USING ALKALI METAL SALTS OF AROMATIC O-HYDROXYCARBOXYLIC ACIDS AS THE POLYMERIZATION CATALYST.
Inventors
- 👤 Hans Joachim Diehr
- 👤 Rudolf Merten
- 👤 Konrad Uhlig
- 👤 Helmut Piechota
- 👤 Christian Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/225; C08G2115/00; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |