US2839495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for resinifying polyepoxides and resulting products
Assignee: Shell Development Co
•
Filing: 1955-11-07
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Granted: 1958-06-17
•
Expires: 1975-11-07
Abstract
No abstract record available.
Inventors
- 👤 James E Carey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:39
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR REINIFYING AND CURING A POLYOXIDE HAVING A 1,2-EPOXY EQUIVALENCY OF AT LEAST 1.1 WHICH COMPRISES MIXING AND REACTING THE POLEPOXIDE WITH A PLYCARBOXYLIC ACID ANHYDRIDE AND AN ACTIVATOR THEREFOR COMPRISING THE ADDITION PRODUCT OF BF3 AND A MEMBER OF THE GROUP CONSISTING OF THE AMINES AND PHENOLS.
Claim 2
Dependent Claim
50 words
A PROCESS FOR REINIFYING AND CURING A POLYOXIDE HAVING A 1,2-EPOXY EQUIVALENCY OF AT LEAST 1.1 WHICH COMPRISES MIXING AND REACTING THE POLEPOXIDE WITH A PLYCARBOXYLIC ACID ANHYDRIDE AND AN ACTIVATOR THEREFOR COMPRISING THE ADDITION PRODUCT OF BF3 AND A MEMBER OF THE GROUP CONSISTING OF THE AMINES AND PHENOLS.
References Cited (Backward Citations)
US2528932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |