US3655780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isomerization process
Assignee: Chevron USA Inc
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Filing: 1968-09-03
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Granted: 1972-04-11
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Expires: 1988-09-03
Abstract
Abstract PROCESS FOR ISOMERIZING O- AND P-ALKYLPHENOLS IN WHICH THE ALKYL CONTAINS AT LEAST 5 CARBON ATOMS TO THEIR CORRESPONDING M-ALKYLPHENOLS INVOLVING HEATING THE O- AND PSPECIES IN THE PRESENCE OF AN ACID-ACTIVATED ALUMINA-SILICATE CLAY HAVING (1) A GENERAL CRYSTAL LATTICE COMPRISING A SHEET OF ALUMINA-OCTANHEDRA BETWEEN 2 SHEETS OF SILICATETRAHEDRA, (2) A (001) LATTICE SPACING OF 10 TO 20 A., (3) LESS THAN 1.4 WEIGHT PERCENT BOUND IRON, (4) A CATIONIC BASE EXCHANGE CAPACTIY OF 80 TO 120 MEQ. AND (5) BASE-EXCHANGE POSITIONS OCCUPIED PREDOMINANTLY BY GROUP II METALS IONS.
Inventors
- 👤 Gustave K Kohn
- 👤 Lawrence E Stevick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
C; C07; C07C; C07C37/00
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |