US2904533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of unsaturated polyesters by the reaction of, first, isophthalic acid and a glycol, followed by reaction with unsaturated aliphatic polybasic acid
Assignee: California Research LLC
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Filing: 1954-09-23
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Granted: 1959-09-15
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Expires: 1974-09-23
Abstract
No abstract record available.
Inventors
- 👤 Earl F Carlston
- 👤 Gordon B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:09
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR THE PREPARATION OF UNSATURATED POLYESTERS WHICH COMPRISES FIRST CONDENSING TO A LOW POLYMER OF ACID NUMBER BELOW ABOUT 10, ISOPHTHALIC ACID AND A MIXTURE OF ETHYLENE AND PROPYLENE GLYCOLS, AND THEN ADDING MALEIC ANHYDRIDE TO THE LOW POLYMER, THE AMOUNT OF ISOPHTHALIC ACID CONDENSED WITH THE ETHYLENE AND PROPYLENE GLYCOLS RANGING FROM ABOUT .5 MOL TO ABOUT 4 MOLS OF ISOPHATHALIC ACID PER MOL OF MALEIC ANHYDRIDE AND THE AMOUNT OF ETHYLENE AND PROPYLENE GLYCOLS BEING EMPLOYED IN A STOICHIOMETRIC EXCESS OF FROM ABOUT 3% TO ABOUT 5% OVER THE COMBINED TOTAL OF ISOPHTHALIC ACID AND MALEIC ANHYDRIDE, SAID SPACIFIED MATERIALS BEING EMPLOYED AS ESSENTIALLY THE SOLE INGREDIENTS, AND CONTINUING THE POLYMERIZATION TO PRODUCE AN UNSATURATED POLYESTER USEFUL IN LOW-PRESSURE OR CONTACT MOLDING AND LAMINATING OPERATIONS.
Claim 2
Dependent Claim
129 words
A PROCESS FOR THE PREPARATION OF UNSATURATED POLYESTERS WHICH COMPRISES FIRST CONDENSING TO A LOW POLYMER OF ACID NUMBER BELOW ABOUT 10, ISOPHTHALIC ACID AND A MIXTURE OF ETHYLENE AND PROPYLENE GLYCOLS, AND THEN ADDING MALEIC ANHYDRIDE TO THE LOW POLYMER, THE AMOUNT OF ISOPHTHALIC ACID CONDENSED WITH THE ETHYLENE AND PROPYLENE GLYCOLS RANGING FROM ABOUT .5 MOL TO ABOUT 4 MOLS OF ISOPHATHALIC ACID PER MOL OF MALEIC ANHYDRIDE AND THE AMOUNT OF ETHYLENE AND PROPYLENE GLYCOLS BEING EMPLOYED IN A STOICHIOMETRIC EXCESS OF FROM ABOUT 3% TO ABOUT 5% OVER THE COMBINED TOTAL OF ISOPHTHALIC ACID AND MALEIC ANHYDRIDE, SAID SPACIFIED MATERIALS BEING EMPLOYED AS ESSENTIALLY THE SOLE INGREDIENTS, AND CONTINUING THE POLYMERIZATION TO PRODUCE AN UNSATURATED POLYESTER USEFUL IN LOW-PRESSURE OR CONTACT MOLDING AND LAMINATING OPERATIONS.
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |