US3576909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyzed isomerization of alpha-beta unsaturated carboxylic acid esters
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1968-01-19
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Granted: 1971-04-27
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Expires: 1988-01-19
Abstract
Abstract MORPHOLINE OR ITS ALKYL DERIVATIVES ARE USED AS CATALYSTS FOR THE ISOMERIZATION OF A-B UNSATURATED ESTERS OF CISCONFIGURATION INTO TRANS-CONFIGERATION. THE ISOMERIZATION MAY PROCEED AT LOW TEMPERATURES WITH GOOD YIELDS AND IS USEFUL FOR PRODUCTION OF FIBER REINFORCED PLASTIC LAMINATION RESINS FROM MALEIC ANHYDRIDE VIA MALERATE POLYESTERS, WHICH ARE THEN ISOMERIZED TO FUMARATE POLYESTERS.
Inventors
- 👤 Claude J Schmidle
- 👤 Arden E Schmucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/56; C08G63/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |