US3632476A
Expired / Lapsed
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Method of producing citric acid by fermentation
Assignee: Pfizer Inc
•
Filing: 1969-05-01
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Granted: 1972-01-04
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Expires: 1989-05-01
Abstract
Abstract A process for producing citric acid with certain Candida strains by aerobically fermenting an aqueous carbohydrate-containing nutrient medium in the presence of lead compounds.
Inventors
- 👤 John H Fried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/40; C12P7/44; C12P7/48; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/921; Y10S435/922; Y10S435/923
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
12 words
The process of claim 1 wherein said lead salt is lead acetate.
Claim 2
Dependent Claim
27 words
The process of claim 1 wherein said lead salt is lead chloride, lead bromide, lead nitrate, lead thiocyanate, lead thiosulfate, lead formate, lead propionate or lead butyrate.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said citric acid accumulating strain of Candida is Candida guilliermondii ATCC No. 9058.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said citric acid accumulating strain of Candida is Candida lipolytica ATCC No. 9773.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said citric acid accumulating strain of Candida is Candida albicans ATCC No. 752.
Claim 6
Dependent Claim
87 words
The process of claim 1 wherein said citric acid accumulating strain of Candida is one of the following: Candida Strain ATCC Culture No. krusoides 7,345 lipolytica 8,661 lipolytica 8,662 melinii 10,568 monosa 2,146 monosa 9,330 mycoderma 9,888 parapsilosis 7,330 parapsilosis 7, 333 Candida Strain ATCC Culture No. parapsilosis 7,336 parapsilosis 10,265 pelliculosa 2,149 albicans 20,032 albicans 753 albicans 2,091 albicans 10,259 albicans 10,261 albicans 11, 651 albicans 14,053 brumptii 10,564 catenulata 10,565 curvata 10, 567 flareri 9,375 guilliermondii 9,390 guilliermondii 14,242 tjaponica 14,437 krusei var. saccharicola 16,047
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |