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US3345339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel polyester process
Assignee: PPG Industries Inc
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Filing: 1963-12-20
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Granted: 1967-10-03
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Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Earl E Parker
- 👤 John G Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:39
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A METHOD OF PREPARING UNSATURATED POLYESTERS COMPRISING (I) REACTIN TO AN ACID NUMBER IN THE RANGE OF 1 TO 40, A MIXTURE CONSISTING ESSENTIALLY OF A SATURATED POLYOL, AND AN AROMATIC POLYCARBOXYLIC ACID SELECTED FROM THE CLASS CONSISTING OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID IN THE PRESENCE OF AN ESTERIFICATION CATALYST WHICH IS A TIN COMPOUND AND (2) SUBSEQUENTLY ESTERIFYING THE REACTION PRODUCT MIXTURE OF STAGE (1) WITH AN ALPHA, BETAETHYLENICALLY UNSATURATED POLYCARBOXYLIC ACID, THERE BEING UTILIZED AT LEAST ABOUT ONE EQUIVALENT OF POLYOL PER EQUIVALENT OF ACID REACTANTS.
Claim 2
Independent Claim
89 words
A METHOD OF PREPARING UNSATURATED POLYESTERS COMPRISING (I) REACTIN TO AN ACID NUMBER IN THE RANGE OF 1 TO 40, A MIXTURE CONSISTING ESSENTIALLY OF A SATURATED POLYOL, AND AN AROMATIC POLYCARBOXYLIC ACID SELECTED FROM THE CLASS CONSISTING OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID IN THE PRESENCE OF AN ESTERIFICATION CATALYST WHICH IS A TIN COMPOUND AND (2) SUBSEQUENTLY ESTERIFYING THE REACTION PRODUCT MIXTURE OF STAGE (1) WITH AN ALPHA, BETAETHYLENICALLY UNSATURATED POLYCARBOXYLIC ACID, THERE BEING UTILIZED AT LEAST ABOUT ONE EQUIVALENT OF POLYOL PER EQUIVALENT OF ACID REACTANTS.
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |