Patent US3644536A successfully refreshed from Google Patents.
US3644536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for 1 3 5-tris(alpha-hydroxy-isopropyl)benzene
Assignee: Pennwalt Corp
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Filing: 1969-09-18
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Granted: 1972-02-22
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Expires: 1989-09-18
Abstract
Abstract PREPARATION OF 1,3,5-TRIS (A-HYDROXYISOPROPYL)BENZENE BY HEATING A SOLVENT SOLUTION OF METHYLBUTYNOL IN PRESENCE OF CATALYTIC AMOUNT OF NICKEL TETRACARBONYL AND A TRIARYLPHOSPHITE.
Inventors
- 👤 Richard A Bafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:53
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/145
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |