Patent US2659733A successfully refreshed from Google Patents.
US2659733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing butyrolactones
Assignee: Merck and Co Inc
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Filing: 1949-04-20
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Granted: 1953-11-17
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Expires: 1969-04-20
Abstract
No abstract record available.
Inventors
- 👤 Folkers Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:03
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE PROCESS FOR PREPARING A-AMINO-B,B-DIMETHYL-Y-BUTYROLACTONE WHICH COMPRISES TREATING A,A-DIMETHYL-B-HYDROXY-PROPIONALDEHYDE IN AN ALCOHOLIC MEDIUM WITH AN AMMONIUM SALT IN THE PRESENCE OF A WATER-SOLUBLE CYANIDE, AND HYDROLYZING THE BUTYRONITRILE FORMED BY MEANS OF A STRONG MINERAL ACID TO OBTAIN THE DESIRED YLACTONE.
Claim 2
Dependent Claim
41 words
THE PROCESS FOR PREPARING A-AMINO-B,B-DIMETHYL-Y-BUTYROLACTONE WHICH COMPRISES TREATING A,A-DIMETHYL-B-HYDROXY-PROPIONALDEHYDE IN AN ALCOHOLIC MEDIUM WITH AN AMMONIUM SALT IN THE PRESENCE OF A WATER-SOLUBLE CYANIDE, AND HYDROLYZING THE BUTYRONITRILE FORMED BY MEANS OF A STRONG MINERAL ACID TO OBTAIN THE DESIRED YLACTONE.
References Cited (Backward Citations)
US2390526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |