Patent US3003922A successfully refreshed from Google Patents.
US3003922A
Expired / Lapsed
US
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Method for producing l-pyrrolidone-carboxylic acid and its salt
Assignee: KH Neochem Co Ltd
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Filing: 1959-11-04
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Granted: 1961-10-10
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Expires: 1979-11-04
Abstract
No abstract record available.
Inventors
- 👤 Kinoshita Shukuo
- 👤 Tanaka Katsunobu
- 👤 Akita Sadao
- 👤 Maruta Yoshiki
- 👤 Yamamoto Yoshihisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:47
CPC Classifications
C; C12; C12P; C12P17/00; C12P17/10; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/874
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD FOR PRODUCING L-PYRROLIDONE CARBOXYLIC ACID, WHICH COMPRISES ACTING AT A PH OF FROM 6 TO 9 AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF PSEUDOMONAS CRUCIVIAE GRAY AND THORNTON AND ENZYME THEREOF, ON AN AQUEOUS SOLUTION CONTAINING LGLUTAMIC ACID, THE RESULTING STARTING REACTION MIXTURE CONTAINING FROM 10 TO 100 MG./ML. OF L-GLUTAMIC ACID AND RECOVERING L-PYRROLIDONE CARBOXYLIC ACID FROM THE RESULTING MIXTURE.
Claim 2
Independent Claim
66 words
A METHOD FOR PRODUCING L-PYRROLIDONE CARBOXYLIC ACID, WHICH COMPRISES ACTING AT A PH OF FROM 6 TO 9 AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF PSEUDOMONAS CRUCIVIAE GRAY AND THORNTON AND ENZYME THEREOF, ON AN AQUEOUS SOLUTION CONTAINING LGLUTAMIC ACID, THE RESULTING STARTING REACTION MIXTURE CONTAINING FROM 10 TO 100 MG./ML. OF L-GLUTAMIC ACID AND RECOVERING L-PYRROLIDONE CARBOXYLIC ACID FROM THE RESULTING MIXTURE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |