US3808101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological method of producing tryptophan and 5-substituted tryptophans
Assignee: Ajinomoto Co Inc
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Filing: 1971-12-20
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Granted: 1974-04-30
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Expires: 1991-12-20
Abstract
Abstract L - TRYPTOPHAN, 5-HYDROXY-L-TRYPTOPHAN, 5-METHYL-LTRYPTOPHAN AND 5-AMINO-L-TRYTOPHAN ARE PRODUCED BY THE ACTION OF TRYPTOPHANASE PRODUCED BY CULTIVATION OF CERTAIN MICROORGANISMS, ON INDOLE, 5-HYDROXYINDOLE, 5-METHYLINDOLE AND 5-AMINOINDOLE, AND AMMONIA, AND PYRUVIC ACID, OXALACETIC ACID, FUMARIC ACID, MALIC ACID, MALEIC OXIME, GLYOXYLIC ACID OR LACTIC ACID.
Inventors
- 👤 H Enei
- 👤 H Nakazawa
- 👤 H Yamada
- 👤 H Matsui
- 👤 S Okumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:32
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/18; C07D209/20; C12P13/22; C12P13/227; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/828; Y10S435/842; Y10S435/847; Y10S435/848; Y10S435/874; Y10S435/879; Y10S435/91
Claims Analysis
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |