Patent DE1145822B successfully refreshed from Google Patents.
US3703541A
Expired / Lapsed
US
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Process for the production of 3-hydroxy-2,2,4-trimethylpentyl isobutyrate
Assignee: Daicel Corp
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Filing: 1970-04-16
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Granted: 1972-11-21
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Expires: 1990-04-16
Abstract
Abstract A PROCESS FOR PRODUCING 3-HYDROXY-2,2,4-TRIMETHYLPENTYL ISOBUTYRATE IN WHICH ISOBUTYRALDEHYDE IS CONDENSED BY EMPLOYING AS A CATALYST AN ALKALI METAL SALT OF A MONOHYDRIC OR POLYHYDRIC PHENOL WHICH IS EITHER UNSUBSTITUTED OR HAS HYDROCARBON OR PHENOLIC SUBSTITUENTS IN THE AROMATIC NUCLEUS THEREOF. THE REACTION IS CARRIED OUT AT A TEMPERATURE OF 70*-100*C. AND THE CATALYST CONCENTRATION IS IN THE RANGE OF FROM 0.3% TO 5% BY WEIGHT BASED ON THE WEIGHT OF THE ALDEHYDE. THE WATER CONTENT OF THE STARTING ALDEHYDE IS LESS THAN 5000 P.P.M.
Inventors
- 👤 Itaru Takasu
- 👤 Takaaki Sasaki
- 👤 Akira Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:02
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/44; C08; C08K; C08K5/00; C08K5/04; C08K5/10
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |