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US3554944A
Expired / Lapsed
US
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Unsaturated polyamide resins
Assignee: Bayer Pharma AG
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Filing: 1968-07-30
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Granted: 1971-01-12
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Expires: 1988-07-30
Abstract
Abstract A RECTIVE UNSATURATED POLYAMIDE RESIN PREPARED BY CONDENSING A HIGH MOLECULAR WEIGHT POLYCARBOXYLIC ACID (C12 OR GREATER) AND AN ALIPHATIC PRIMARY OR SECONDARY DIAMINE (C3 OR GREATER) TO FORM A PRODUCT WITH FREE AMINO GROUPS WHICH ARE THEN REACTED WITH MALEIC ACID ANHYDRIDE. THE UNSATURATED POLYAMIDE RESIN CAN ALSO BE FURTHER MODIFIED BY REACTION OF THE CARBOXYL GROUPS WITH MONO- OR DI-EPOXIDE COMPOUNDS. HARDENABLE MIXTURES OF SUCH A RESIN WITH A COPOLYMERIZABLE MONOMER SUCH AS STYRENE. RESIN BODIES PREPARED BY HARDENING SUCH MIXTURES BY FREE-RADICAL POLYMERIZATION.
Inventors
- 👤 Dietrich Helm
- 👤 Rainer Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:34
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/34
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |