US2638436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Culture of phage-sensitive streptomyces griseus
Assignee: Mathieson Chemical Corp
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Filing: 1949-06-11
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Granted: 1953-05-12
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Expires: 1969-06-11
Abstract
No abstract record available.
Inventors
- 👤 Perlman David
- 👤 Asger F Langlykke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:12
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/20; C12N1/36; C12P; C12P19/00; C12P19/26; C12P19/28; C12P19/42; C12P19/44; C12P19/46; C12P19/54; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/886; Y10S435/897
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE METHOD OF CULTURING A PHAGE-SENSITIVE STRAIN OF STREPTOMYCES GRISEUS IN CONTACT WITH A SUITABLE CULTURE MEDIUM TO PRODUCE A METABOLITE OF THE GROUP CONSISTING OF STREPTOMYCIN AND VITAMIN B12, MINIMIZING POSSIBILITY OF LOSS OF PRODUCTION OF SAID METABOLITE DUE TO PHAGE ACTION BY INCORPORATING IN THE MEDIUM A PHAGEMULTIPLICATION INHIBITOR OF THE GROUP CONSISTING OF LACTIC ACID, TARTARIC ACID, GLUCONIC ACID, CITRIC ACID, OXALIC ACID, PHYTIC ACID, AND WATER-SOLUBLE SALTS THEREOF, THE INITIAL MOLAR CONCENTRATION OF THE OXALIC ACID AND OXALATES BEING AT LEAST OF THE ORDER OF 0.003, OF CITRIC ACID AND THE CITRATES BEING AT LEAST OF THE ORDER OF 0.01, AND OF THE REMAINING MEMBERS OF THE GROUP BEING AT LEAST OF THE ORDER OF 0.03.
Claim 2
Dependent Claim
121 words
IN THE METHOD OF CULTURING A PHAGE-SENSITIVE STRAIN OF STREPTOMYCES GRISEUS IN CONTACT WITH A SUITABLE CULTURE MEDIUM TO PRODUCE A METABOLITE OF THE GROUP CONSISTING OF STREPTOMYCIN AND VITAMIN B12, MINIMIZING POSSIBILITY OF LOSS OF PRODUCTION OF SAID METABOLITE DUE TO PHAGE ACTION BY INCORPORATING IN THE MEDIUM A PHAGEMULTIPLICATION INHIBITOR OF THE GROUP CONSISTING OF LACTIC ACID, TARTARIC ACID, GLUCONIC ACID, CITRIC ACID, OXALIC ACID, PHYTIC ACID, AND WATER-SOLUBLE SALTS THEREOF, THE INITIAL MOLAR CONCENTRATION OF THE OXALIC ACID AND OXALATES BEING AT LEAST OF THE ORDER OF 0.003, OF CITRIC ACID AND THE CITRATES BEING AT LEAST OF THE ORDER OF 0.01, AND OF THE REMAINING MEMBERS OF THE GROUP BEING AT LEAST OF THE ORDER OF 0.03.
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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |