Patent US2993838A successfully refreshed from Google Patents.
US2993838A
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Method of producing citric acid by fermentation
Assignee: KH Neochem Co Ltd
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Filing: 1958-08-04
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Granted: 1961-07-25
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Expires: 1978-08-04
Abstract
No abstract record available.
Inventors
- 👤 Kinoshita Shukuo
- 👤 Terada Osamu
- 👤 Oishi Kazuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:33
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/40; C12P7/44; C12P7/48; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD WHICH COMPRISES CULTURING UNDER AEROBIC CONDITIONS A CITRIC ACID-PRODUCING STRAIN OF TRICHODERMA VIRIDE IN A CULTURING MEDIUM CONTAINING CARBOHYDRATE MATERIAL, NITROGEN SOURCE AND INORGANIC MINERAL SOURCE AT A PH OF FROM 3.0 TO 7.0, PRODUCING IN SAID MEDIUM CITRIC ACID AND ITS SALT, AND RECOVERING THE SAME.
Claim 2
Independent Claim
49 words
A METHOD WHICH COMPRISES CULTURING UNDER AEROBIC CONDITIONS A CITRIC ACID-PRODUCING STRAIN OF TRICHODERMA VIRIDE IN A CULTURING MEDIUM CONTAINING CARBOHYDRATE MATERIAL, NITROGEN SOURCE AND INORGANIC MINERAL SOURCE AT A PH OF FROM 3.0 TO 7.0, PRODUCING IN SAID MEDIUM CITRIC ACID AND ITS SALT, AND RECOVERING THE SAME.
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) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |