US3579521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of vinyl substituted aromatics from methyl substituted aromatics
Assignee: Monsanto Co
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Filing: 1969-01-15
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Granted: 1971-05-18
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Expires: 1989-01-15
Abstract
Abstract VINYL SUBSTITUTED AROMATIC COMPOUNDS ARE PRODUCED IN A NON-CATALYTIC PROCESS BY CONTACTING A METHYL SUBSTITUTED AROMATIC COMPOUND WITH AN OXYGEN CONTAINING ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACETIC ACID, DIMETHYL ETHER, DI-T-BUTYL PEROXIDE AND DIKETENE. THE CONTACTING IS CARRIED OUT AT A TEMPERATURE OF FROM ABOUT 700 TO ABOUT 950*C. AT A PRESSURE OF NOT MORE THAN FOUR ATMOSPHERES ABSOLUTE.
Inventors
- 👤 Raymond A Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:06
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/42; C07C5/50; C07C5/52; C07C6/00; C07C6/08; C07C6/12; C07C6/123
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |