US2921049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin and process of making and curing the same
Assignee: Reichhold Chemicals Inc
•
Filing: 1955-09-16
•
Granted: 1960-01-12
•
Expires: 1975-09-16
Abstract
No abstract record available.
Inventors
- 👤 Harold L Moroson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:44
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS OF PRODUCING A LIQUID EPOXY RESIN WHICH COMPRISES INITIALLY REACTING DIPHENYLOPROPANE AND EPICHLOROHYDRIN IN THE PROPORTION OF 2 TO 3 MOLES OF EPICHLOROHYDRIN TO 1 MOLE OF DIPHENYLOPROPANE UNDER ALKALINE CONDITIONS AT A TEMPERATURE WITHIN THE APPROXIMATE RANGE OF 40 TO 70*C. TO PRODUCE A RESIN INTERMEDIATE, THEREAFTER ADDING TO THE RESINOUS REACTION MIXTURE FROM 10 TO 25% OF ITS WEIGHT OF EPICHLOROHYDRIN AND THEN AZEOTROPICALLY STRIPPING THE RESINUOUS INTERMEDIATE TO PRODUCE A FINAL LIQUID RESIN OF DESIRED VICOSITY WITH SUBSTANTIALLY COMPLETE RECOVERY OF THE ADDED EPICHLOROHYDRIN.
Claim 2
Dependent Claim
89 words
A PROCESS OF PRODUCING A LIQUID EPOXY RESIN WHICH COMPRISES INITIALLY REACTING DIPHENYLOPROPANE AND EPICHLOROHYDRIN IN THE PROPORTION OF 2 TO 3 MOLES OF EPICHLOROHYDRIN TO 1 MOLE OF DIPHENYLOPROPANE UNDER ALKALINE CONDITIONS AT A TEMPERATURE WITHIN THE APPROXIMATE RANGE OF 40 TO 70*C. TO PRODUCE A RESIN INTERMEDIATE, THEREAFTER ADDING TO THE RESINOUS REACTION MIXTURE FROM 10 TO 25% OF ITS WEIGHT OF EPICHLOROHYDRIN AND THEN AZEOTROPICALLY STRIPPING THE RESINUOUS INTERMEDIATE TO PRODUCE A FINAL LIQUID RESIN OF DESIRED VICOSITY WITH SUBSTANTIALLY COMPLETE RECOVERY OF THE ADDED EPICHLOROHYDRIN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |