US3642907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetonylacetone and para-cresol by oxidation of methacrolein dimer
Assignee: Atlantic Richfield Co
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Filing: 1968-10-01
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Granted: 1972-02-15
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Expires: 1988-10-01
Abstract
Abstract A PROCESS COMPRISING THE CATALYTIC AIR OXIDATION OF METHACROLEIN DIMER (3,4-DIHYDRO-2,5-DIMETHYL-2H-PYRAN2-CARBOXALDEHYDE) TO PRODUCE ACETONYLACETONE (2,5-HEXANEDIONE) AND P-CRESOL IS DISCLOSED. CONVENTIONAL TRANSITION METAL OXIDATION CATALYSTS ARE USED.
Inventors
- 👤 Thomas A Schenach
- 👤 David L Trimble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:02
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/56; C07C45/57; C07C45/60; C07C37/00; C07C37/50
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |