Patent US4646130A successfully refreshed from Google Patents.
US3255236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester-ester interchange in the presence of an aluminum alkyl catalyst
Assignee: Gulf Research and Development Co
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Filing: 1962-05-29
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Granted: 1966-06-07
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Expires: 1982-05-29
Abstract
No abstract record available.
Inventors
- 👤 Charles M Selwitz
- 👤 Robert A Walde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
IN THE PROCESS OF CATALYTICALLY EFFECTING ESTER-ESTER INTERCHANGE BETWEEN CARBOXYLIC ACID ESTERS UNDER ANHYDROUS CONDITIONS, THE IMPROVEMENT WHICH COMPRISES INCORPORATING WITH THE REACTANTS A CATALYSTIC AMOUNT OF AN ALUMINUM ALKYL HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
34 words
IN THE PROCESS OF CATALYTICALLY EFFECTING ESTER-ESTER INTERCHANGE BETWEEN CARBOXYLIC ACID ESTERS UNDER ANHYDROUS CONDITIONS, THE IMPROVEMENT WHICH COMPRISES INCORPORATING WITH THE REACTANTS A CATALYSTIC AMOUNT OF AN ALUMINUM ALKYL HAVING THE STRUCTURAL FORMULA
References Cited (Backward Citations)
US2388428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |