Patent US2837532A successfully refreshed from Google Patents.
US2837532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of glutamic acid
Assignee: International Minerals and Chemical Corp
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Filing: 1956-02-28
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Granted: 1958-06-03
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Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Purvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:26
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A PROCESS FOR PREPARING AN ALPHA-AMINO DICARBOXYLIC ACID WHICH COMPRISES HEATING AMMONIA AT A TEMPERATURE ABOVE ABOUT 200*C. WITH A GLUTARIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALPHA-CHLOROGLUTARIC ACID, ALPHA-HYDROXYGLUTARIC ACID, ALPHA-HYDROXYGLUTARIC ACID LACTONE, AND THE ALKYL-SUBSTITUTED HOMOLOGUES THEREOF WHEREIN THE ALKYL SUBSTITUENT CONTAINS LESS THAN EIGHT CARBON ATOMS UNTIL THE REACTION OF AMMONIA THEREWITH IS SUBSTANTIALLY COMPLETE, HYDROLYZING ANY AMINO ACID PRECURSOR COMPOUNDS THEREIN, AND RECOVERING SAID ALPHA-AMINO DICARBOXYLIC ACID THEREFROM.
Claim 2
Dependent Claim
74 words
A PROCESS FOR PREPARING AN ALPHA-AMINO DICARBOXYLIC ACID WHICH COMPRISES HEATING AMMONIA AT A TEMPERATURE ABOVE ABOUT 200*C. WITH A GLUTARIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALPHA-CHLOROGLUTARIC ACID, ALPHA-HYDROXYGLUTARIC ACID, ALPHA-HYDROXYGLUTARIC ACID LACTONE, AND THE ALKYL-SUBSTITUTED HOMOLOGUES THEREOF WHEREIN THE ALKYL SUBSTITUENT CONTAINS LESS THAN EIGHT CARBON ATOMS UNTIL THE REACTION OF AMMONIA THEREWITH IS SUBSTANTIALLY COMPLETE, HYDROLYZING ANY AMINO ACID PRECURSOR COMPOUNDS THEREIN, AND RECOVERING SAID ALPHA-AMINO DICARBOXYLIC ACID THEREFROM.
Claim 3
Dependent Claim
49 words
A PROCESS FOR PREPARING THE AMMONIUM SALT OF 2OXO-5-PYRROLIDINE CARBOXYLIC ACID WHICH COMPRISES HEATING AMMONIA AT A TEMPERATURE ABOVE ABOUT 200*C. WITH A GLUTARIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALPHA-HALOGLUTARIC ACID, ALPHA-HYDROXYGLUTARIC ACID, AND ALPHA-HYDROXYGLUTARIC ACID LACTONE UNTIL THE REACTION OF AMMONIA THEREWITH IS SUBSTANTIALLY COMPLETE.
Claim 4
Dependent Claim
49 words
A PROCESS FOR PREPARING THE AMMONIUM SALT OF 2OXO-5-PYRROLIDINE CARBOXYLIC ACID WHICH COMPRISES HEATING AMMONIA AT A TEMPERATURE ABOVE ABOUT 200*C. WITH A GLUTARIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALPHA-HALOGLUTARIC ACID, ALPHA-HYDROXYGLUTARIC ACID, AND ALPHA-HYDROXYGLUTARIC ACID LACTONE UNTIL THE REACTION OF AMMONIA THEREWITH IS SUBSTANTIALLY COMPLETE.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |