Patent US3893976A successfully refreshed from Google Patents.
US3893976A
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Polyester resins
Assignee: General Mills Chemicals Inc
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Filing: 1974-08-23
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Granted: 1975-07-08
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Expires: 1994-08-23
Abstract
Abstract Low modulus of elasticity polyesters derived from 1,4-butanediol and terephthalic acid, isophthalic acid and an acid selected from certain cyclic dicarboxylic acids.
Inventors
- 👤 Robert F Modler
- 👤 Stuart A Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:21
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199; C08G63/52; C08G63/54; C08G63/553
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
49 words
A POLYESTER HAVING AN INHERENT VISCOSITY OF ABOUT 0.4 TO 1.0 MEASURED IN ORTHOCHLOROPHENOL SOLVENT, AT A CONCENTRATION OF 0.5% BY WEIGHT AND AT A TEMPERATURE OF 30*C. CONSISTING ESSENTIALLY OF THE CONDENSATION PRODUCT OF 1,4-BUTANEDIOL, TEREPHTHALIC ACID, ISOPHTHALIC ACID AND A CYCLICAL DICARBOXYLIC ACID HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
49 words
A POLYESTER HAVING AN INHERENT VISCOSITY OF ABOUT 0.4 TO 1.0 MEASURED IN ORTHOCHLOROPHENOL SOLVENT, AT A CONCENTRATION OF 0.5% BY WEIGHT AND AT A TEMPERATURE OF 30*C. CONSISTING ESSENTIALLY OF THE CONDENSATION PRODUCT OF 1,4-BUTANEDIOL, TEREPHTHALIC ACID, ISOPHTHALIC ACID AND A CYCLICAL DICARBOXYLIC ACID HAVING THE STRUCTURAL FORMULA
Claim 3
Dependent Claim
22 words
The polyester of claim 1 wherein the cyclic dicarboxylic acid component is a hydrogenated addition product of methyl acrylate and methyl eleostearate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |