Patent US3838320A successfully refreshed from Google Patents.
Patent US2857359A successfully refreshed from Google Patents.
US2857359A
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Process for preparing thixotropic polyester resin composition and product obtained thereby
Assignee: Wyeth Holdings LLC
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Filing: 1955-12-20
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Granted: 1958-10-21
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Expires: 1975-12-20
Abstract
No abstract record available.
Inventors
- 👤 Schollick Francis
- 👤 Downing Brian York
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:01
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PREPARING A SUBSTANTIALLY THIXOTROPIC COMPOSITION COMPRISING HEATING A CRYSTALLINE POLYESTER RESIN TO A TEMPERATURE SUCH THAT IT SOFTENS AND LIQUEFIES TO FORM A CLOUDY LIQUD, AND MIXING WITH SAID LIQUID AN AMORPHOUS INSATURATED POLYESTER RESIN IN SOLUTION WITH A COPOLYMERIZABLE MONOMER CONTAINING A CH2=C<. GROUP, WHEREIN SAID CRYSTALLINE POLYERSTER RESIN IS PREPARED BY REACTING FUMARIC ACID WITH A SYMMETRICAL GLYCOL HAVING THE GENERAL FORMULA HO(CH2)XOH IN WHICH X IS A WHOLE EVEN NUMBER FROM 2-18, INCLUSIVE, AND SAID AMORPHUS POLYESTER RESIN IS THE REACTION PRODUCT OFF AN A,B-ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID AND A GLYCOL.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PREPARING A SUBSTANTIALLY THIXOTROPIC COMPOSITION COMPRISING HEATING A CRYSTALLINE POLYESTER RESIN TO A TEMPERATURE SUCH THAT IT SOFTENS AND LIQUEFIES TO FORM A CLOUDY LIQUD, AND MIXING WITH SAID LIQUID AN AMORPHOUS INSATURATED POLYESTER RESIN IN SOLUTION WITH A COPOLYMERIZABLE MONOMER CONTAINING A CH2=C<. GROUP, WHEREIN SAID CRYSTALLINE POLYERSTER RESIN IS PREPARED BY REACTING FUMARIC ACID WITH A SYMMETRICAL GLYCOL HAVING THE GENERAL FORMULA HO(CH2)XOH IN WHICH X IS A WHOLE EVEN NUMBER FROM 2-18, INCLUSIVE, AND SAID AMORPHUS POLYESTER RESIN IS THE REACTION PRODUCT OFF AN A,B-ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID AND A GLYCOL.
References Cited (Backward Citations)
US2255313A
Cited
GB644287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |