Patent US2928808A successfully refreshed from Google Patents.
US2928808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing of polyepoxides
Assignee: Celanese Coatings Co
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Filing: 1956-12-10
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Granted: 1960-03-15
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Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 William J Belanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:56
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/686; C08G59/40; C08G59/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF CURING A COMPOSITION CONSISTING ESSENTIALLY OF A GLYCIDYL POLYETHER OF A POLYHYDRIC COMPOUND OF THE GROUP CONSISTING OF POLYHYDRIC ALCHOLS AND PHENOLS HAVING AT LEAST TWO PHENOLIC HYDROXYL GROUPS THAT CONSISTS IN HEAT REACTING THE GLYCIDYL POLYETHER WITH ONE TO TEN PERCENT OF A QUATERNARY AMMONIUM SALT SELECTED FROM THE GROUP CONSISTING OF TETRAALKYL, ARYL TRIALKYL AND ALKARYL TRIALKYL AMMONIUM SALTS OF STRONG ACIDS WHEREIN THE ARYL, ALKARYL AND ALKYL SUBSTITUENTS HAVE NO MORE THAN EIGNT CARBON ATOMS.
Claim 2
Independent Claim
81 words
A METHOD OF CURING A COMPOSITION CONSISTING ESSENTIALLY OF A GLYCIDYL POLYETHER OF A POLYHYDRIC COMPOUND OF THE GROUP CONSISTING OF POLYHYDRIC ALCHOLS AND PHENOLS HAVING AT LEAST TWO PHENOLIC HYDROXYL GROUPS THAT CONSISTS IN HEAT REACTING THE GLYCIDYL POLYETHER WITH ONE TO TEN PERCENT OF A QUATERNARY AMMONIUM SALT SELECTED FROM THE GROUP CONSISTING OF TETRAALKYL, ARYL TRIALKYL AND ALKARYL TRIALKYL AMMONIUM SALTS OF STRONG ACIDS WHEREIN THE ARYL, ALKARYL AND ALKYL SUBSTITUENTS HAVE NO MORE THAN EIGNT CARBON ATOMS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |