Patent US3290227A successfully refreshed from Google Patents.
US3290227A
Expired / Lapsed
US
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Process for production of citric acid
Assignee: Bayer Corp
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Filing: 1964-06-11
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Granted: 1966-12-06
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Expires: 1984-06-11
Abstract
No abstract record available.
Inventors
- 👤 Batti Mario Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:58
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/40; C12P7/44; C12P7/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR PRODUCING CITRIC ACID WHICH COMPRISES CONTACTING A CITRIC ACID-PRODUCING FERMENTATION MEDIUM IN WHICH CITRIC ACID HAS BEGUN TO FORM RESULTING IN A PH OF LESS THAN ABOUT 2.0 AND TO WHICH AERATION HAS BEEN INTERRUPTED FOR AT LEAST ABOUT TWO MINUTES SUBSEQUENT TO THE BEGINNING OF CITRIC ACID FORMATION WITH AN ALKALINE MATERIAL TO INCREASE THE PH OF SAID MEDIUM TO A VALUE OF AT LEAST ABOUT 2.0, THEREBY PROMOTING THE CITRIC ACID-PRODUCING ACTIVITY OF SAID MEDIUM.
Claim 2
Dependent Claim
80 words
A PROCESS FOR PRODUCING CITRIC ACID WHICH COMPRISES CONTACTING A CITRIC ACID-PRODUCING FERMENTATION MEDIUM IN WHICH CITRIC ACID HAS BEGUN TO FORM RESULTING IN A PH OF LESS THAN ABOUT 2.0 AND TO WHICH AERATION HAS BEEN INTERRUPTED FOR AT LEAST ABOUT TWO MINUTES SUBSEQUENT TO THE BEGINNING OF CITRIC ACID FORMATION WITH AN ALKALINE MATERIAL TO INCREASE THE PH OF SAID MEDIUM TO A VALUE OF AT LEAST ABOUT 2.0, THEREBY PROMOTING THE CITRIC ACID-PRODUCING ACTIVITY OF SAID MEDIUM.
References Cited (Backward Citations)
US3083144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |