US3553166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of imidazole complexes and nitrogenous compound as curing agents for epoxy resins
Assignee: PPG Industries Inc
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Filing: 1968-02-02
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Granted: 1971-01-05
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Expires: 1988-02-02
Abstract
Abstract EPOXY RESINS ARE BLENDED WITH A CURING AGENT COMPRISING A MIXTURE OF METAL SALT COMPLEXES OF IMIDAZOLES AND NITROGENOUS COMPOUNDS SUCH AS UREA, DICYANDIAMIDE, MELAMINES AND THIOUREAS TO FORM COMPOSITIONS WHICH REMAIN IN THE UNCURED STATE FOR LONG PERIODS OF TIME AT ROOM TEMPERATURE, CURE CONVENIENTLY AT ELEVATED TEMPERATURES AND HAVE EXCELLENT SHEAR STRENGTH AND PEEL STRENGTH. THESE EPOXY RESIN COMPOSITIONS MAY BE USED AS COATINGS, ADHESIVES, POTTING COMPOUNDS, CASTINGS AND LAMINATES.
Inventors
- 👤 Carl C Anderson
- 👤 Rostyslaw Dowbenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:42
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/30; C08G59/306; C08G59/40; C08G59/50; C08G59/5093; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |