Patent US2521911A successfully refreshed from Google Patents.
US2521911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-aldehyde and epoxide resin compositions
Assignee: Celanese Coatings Co
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Filing: 1946-03-08
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Granted: 1950-09-12
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Expires: 1966-03-08
Abstract
No abstract record available.
Inventors
- 👤 Greenlce Sylvan Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
C; C08; C08G; C08G81/00; C08L; C08L63/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
PHENOL-ALDEHYDE AND EPOXY RESIN COMPOSITIONS CONTAINING IN SUBSTANTIAL PROPORTIONS A PHENOL-ALDEHYDE CONDENSATE CONTAINING REACTIVE HYDROXYL GROUPS AND A COMPLEX, NORMALLY SOLID EPOXIDE RESIN WHICH IS A POLYETHER DERIVATIVE OF A POLYHYDRIC PHENOL CONTAINING EPOXY GROUPS AND FREE FROM FUNCTIONAL GROUPS OTHER THAN EPOXY AND HYDROXYL GROUPS.
Claim 2
Dependent Claim
46 words
PHENOL-ALDEHYDE AND EPOXY RESIN COMPOSITIONS CONTAINING IN SUBSTANTIAL PROPORTIONS A PHENOL-ALDEHYDE CONDENSATE CONTAINING REACTIVE HYDROXYL GROUPS AND A COMPLEX, NORMALLY SOLID EPOXIDE RESIN WHICH IS A POLYETHER DERIVATIVE OF A POLYHYDRIC PHENOL CONTAINING EPOXY GROUPS AND FREE FROM FUNCTIONAL GROUPS OTHER THAN EPOXY AND HYDROXYL GROUPS.
References Cited (Backward Citations)
US1952243A
Cited
DE576117C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |