US2852530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a pantothenic acid intermediate
Assignee: Pharmacia and Upjohn Co
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Filing: 1954-07-19
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Granted: 1958-09-16
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Expires: 1974-07-19
Abstract
No abstract record available.
Inventors
- 👤 Jared H Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:51
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33; C07C; C07C255/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
A PROCESS WHICH COMPRISES REACTING ISOBUTYRALDEHYDE AND FORMALDEHYDE IN THE PRESENCE OF AN ALKALI-MET-AL CARBONATE CATALYST AT A TEMPERATURE BETWEEN ABOUT 25 AND ABOUT 45 DEGREES CENTIGRADE TO PRODUCE A REACTION MIXTURE CONTAINING FORMOISOBUTYRALDOL, CONVERTING THE FORMOISOBUTYRALDOL TO A,Y-DIHYDROXY-B,B-DIMETHYLBUTYRONITRILE BY REACTING THE FORMOISOBUTYRALDOL IN THE PRESENCE OF WATER WITH AT LEAST ONE MOLE OF AN ALKLAI-METAL BICARBONATE AND AT LEAST ONE MOLE OF ALKALI-METAL CYANIDE PER MOLE OF FORMOISOBUTYRALDOL AT A TEMPERATURE BETWEEN ABOUT MINUS FIVE AND ABOUT 45 DEGREES CENTIGRADE AND HYDROLYZING AND LOCATONIZING THE RESULTING A,Y-DIHYDROXYB,B-DIMETHYLBUTYRONITRILE TO PRODUCE A-HYDROXY-B,B-DIMETHYL-Y-BUTYROLACTONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |