US2995602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of glutamic acid from gammabutyrolactone-carboxylic acid or alpha-hydroxyglutaric acid
Assignee: Individual
•
Filing: 1956-12-05
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Granted: 1961-08-08
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Expires: 1976-12-05
Abstract
No abstract record available.
Inventors
- 👤 Kawai Yoshio
- 👤 Matsumi Kei
- 👤 Fuse Mutsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:38
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/38; C07C227/40; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A PROCESS FOR PRODUCING GLUTAMIC ACID, WHICH COMPRISES CONTACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF GAMMA-BUTYROLACTONE-CARBOXYLIC ACID, ALPHAHYDROXYGLUTARIC ACID, METHYL GAMMA-BUTYROLACTONE-CARBOXYLATE, DIMETHYL ALPHA-HYDROXYGLUTARATE, AND DIETHYL ALPHA-HYDROXYGLUTARATE, WITH AMMONIA UNDER SUPERATMOSPHERIC PRESSURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO FORM AN ALPHA-HYDROXYGLUTARIC AMIDE, HEATING THE AMIDE AT A TEMPERATURE OF ABOUT 200*C. FOR A TIME SUFFICIENT TO FORM THE CORRESPONDING CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE AMMONIUM SALT OF GAMMA-PYRROLIDONECARBOXYLIC ACID AND GAMMA-PYRROLIDONE-CARBOXYLIC AMIDE, AND HYDROLYZING THE CYLIC COMPOUND TO GLUTAMIC ACID.
Claim 2
Dependent Claim
88 words
A PROCESS FOR PRODUCING GLUTAMIC ACID, WHICH COMPRISES CONTACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF GAMMA-BUTYROLACTONE-CARBOXYLIC ACID, ALPHAHYDROXYGLUTARIC ACID, METHYL GAMMA-BUTYROLACTONE-CARBOXYLATE, DIMETHYL ALPHA-HYDROXYGLUTARATE, AND DIETHYL ALPHA-HYDROXYGLUTARATE, WITH AMMONIA UNDER SUPERATMOSPHERIC PRESSURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO FORM AN ALPHA-HYDROXYGLUTARIC AMIDE, HEATING THE AMIDE AT A TEMPERATURE OF ABOUT 200*C. FOR A TIME SUFFICIENT TO FORM THE CORRESPONDING CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE AMMONIUM SALT OF GAMMA-PYRROLIDONECARBOXYLIC ACID AND GAMMA-PYRROLIDONE-CARBOXYLIC AMIDE, AND HYDROLYZING THE CYLIC COMPOUND TO GLUTAMIC ACID.
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) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |