US3733253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing citric acid
Assignee: Takeda Pharmaceutical Co Ltd
•
Filing: 1970-07-15
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Granted: 1973-05-15
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Expires: 1990-07-15
Abstract
Abstract CITRIC ACID IS PRODUCED BY A PROCESS WHICH COMPRISES CONTACTING (+)-ISOCITRIC ACID WITH A FERMENTATION BROTH OF A YEAST CAPABLE OF ACCUMULATING (+)-ISOCITRIC ACID BELONGING TO THE GENUS SACCHAROMYCES, CANDIDA, BRETTANOMYCES, DDEBARYOMYCES, HANSENULA, KLOECKERE, TRICHOSPORON, TORULOPSIS OR PICHIA, THE CELLS OF SAID YEAST, OR A PROCESSED MATTER DERIVED FROM THE BROTH OR THE YEAST CELLS, AT PH 7.0 TO 9.5, THEREBY CONVERTING (+)-ISOCITRIC ACID TO CITRIC ACID AND SUBSEQUENTLY RECOVERING THE CITRIC ACID SO ACCUMULATED.
Inventors
- 👤 T Suzuki
- 👤 Y Sumino
- 👤 S Akiyama
- 👤 H Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:00
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/40; C12P7/44; C12P7/48; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/921; Y10S435/923; Y10S435/924; Y10S435/93; Y10S435/938
Claims Analysis
Total Claims: 0
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |