US3595970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hardening epoxy resins with fluophosphoric acid
Assignee: Hoechst AG
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Filing: 1969-05-19
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Granted: 1971-07-27
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Expires: 1989-05-19
Abstract
Abstract PROCESS FOR HARDENING EPOXY COMPOUNDS HAVING MORE THAN ONE EPOXY GROUP PER MOLECULE, IF DESIRED WITH ADDITION OF LACTONES OR COPOLYMERIZABL CYCLIC ETHERS, COMPRISING USING FLUOPHOSPHORIC ACID, IF DESIRED IN ADMIXTURE WITH ACID PHOSPHORUS COMPOUNDS AS HARDENER FOR EPOXY RESIN TO PROVIDE FOR LOW TEMPERATURE HARDENING, INCREASED HARDENING RATE, AND IMPROVED MECHANICAL PROPERTIES OF THE HARDENING RESIN.
Inventors
- 👤 Ernst Nolken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:57
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/18; C08G59/40; C08G59/4007; C08G59/4071; C08G59/62; C08G59/625
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |