Patent US3493737A successfully refreshed from Google Patents.
Patent US2824855A successfully refreshed from Google Patents.
US2824855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of epoxide resins
Assignee: Freeman Chemical Corp
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Filing: 1954-12-20
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Granted: 1958-02-25
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Stephen E Freeman
- 👤 Gordon W Gottschalk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:23
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD OF REMOVING WATER FROM AN EPOXIDE RESIN REACTION PRODUCT CONTAINING WATER, AN EPOXIDE RESIN WHICH IS PRODUCED BY THE CONDENSATION OF A HALOHYDRIN AND A POLYFUNCTIONAL PHENOL IN THE PRESENCE OF CAUSTIC ALKALI, AND REMAINING ALKALI-CONTAINING RESIDUAL MATTER THAT IS PRESENT AFTER THE EPOXIDE IS FORMED FROM SAID CONDENSATION REACTION WITHOUT NECESSITATING FURTHER POLYMERIZATION OF THE EPOXIDE RESIN TO A GEL, WHICH COMPRISES DISTILLING WATER FROM SAID REACTION PRODUCT, PRIOR TO THE REMOVAL OF RESIDUAL MATTER FROM THE EPOXIDE RESIN, WITH THE AID OF A STRIPPING LIQUID WHICH BOILS FROM SAID REACTION PRODUCT AT A TEMPERATURE OF ABOUT 70-90*C.
Claim 2
Independent Claim
101 words
A METHOD OF REMOVING WATER FROM AN EPOXIDE RESIN REACTION PRODUCT CONTAINING WATER, AN EPOXIDE RESIN WHICH IS PRODUCED BY THE CONDENSATION OF A HALOHYDRIN AND A POLYFUNCTIONAL PHENOL IN THE PRESENCE OF CAUSTIC ALKALI, AND REMAINING ALKALI-CONTAINING RESIDUAL MATTER THAT IS PRESENT AFTER THE EPOXIDE IS FORMED FROM SAID CONDENSATION REACTION WITHOUT NECESSITATING FURTHER POLYMERIZATION OF THE EPOXIDE RESIN TO A GEL, WHICH COMPRISES DISTILLING WATER FROM SAID REACTION PRODUCT, PRIOR TO THE REMOVAL OF RESIDUAL MATTER FROM THE EPOXIDE RESIN, WITH THE AID OF A STRIPPING LIQUID WHICH BOILS FROM SAID REACTION PRODUCT AT A TEMPERATURE OF ABOUT 70-90*C.
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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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |