US3009922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for obtaining d(-)-alpha-hydroxy-beta, beta-dimethyl-gamma-butyrolactone
Assignee: Nopco Chemical Co
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Filing: 1958-06-19
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Granted: 1961-11-21
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Expires: 1978-06-19
Abstract
No abstract record available.
Inventors
- 👤 Howard C Klein
- 👤 Kapp Roland
- 👤 Griffith Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A PROCESS FOR OBTAINING D(-)-A-HYDROXY-B,B-DIMETHYL-$-BUTYROLACTONE FROM RACEMIC A,$-DIHYDROXY-B,-BDIMETHYL BUTYRAMIDE WHICH COMPRISES THE STEPS OF BRINGING INTO CONTACT WITH EACH OTHER FROM ABOUT 0.5 TO 0.55 MOL OF L-BRUCINE AND ONE MOL OF RACEMIC A-Y-DIHYDROXYB,B-DIMETHYL BUTYRAMIDE IN METHANOL AT A TEMPERATURE OF FROM ABOUT 40*C. UP TO THE REFLUX TEMPERATURE OF THE RESULTING REACTION MIXTURE, RECOVERING FROM THE REACTION MIXTURE A COMPLEX OF 1-BRUCINE-D(-)-A-HYDROXY-B,BDIMETHYL-$-BUTYROLACTONE, REACTING SAID COMPLEX WITH SODIUM HYDROXIDE, THEREBY FORMING D(+)-SODIUM PANTOATE, AND TREATING SAID D(+)-SODIUM PANTOATE WITH AN ACID THEREBY OBTAINING SAID D(-)-A-HYDROXY-B,B-DIMETHYL-$-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) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |