US2841532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fermentation process for the production of l-lysine
Assignee: Pfizer Inc
•
Filing: 1956-10-18
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Granted: 1958-07-01
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 Donald A Kita
- 👤 Hsing T Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:01
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; C12P13/08; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/848; Y10S435/849
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR THE PREPARATION OF L-LYSINE, WHICH PROCESS COMPRISES FERMENTING A NEUTRIENT MEDIUM INITIALLY CONTAINING FROM ABOUT 0.1 TO ABOUT 0.5 GRAM OF L-LYSINE PER LITER, WITH A MUTANT OF E. COLI WHICH INITIALLY REQUIRES L-LYSINE FOR GROWTH, UNDER SUBMERGED, AEROBIC CONDITIONS, ADJUSTING THE PH TO BETWEEN 7.2 AND 8.2, RUPTURING THE CELL WALL OF THE ORGANISM, AND THEN CONTINUING THE REACTION UNDER ANEROBIC CONDITIONS.
Claim 2
Dependent Claim
66 words
A PROCESS FOR THE PREPARATION OF L-LYSINE, WHICH PROCESS COMPRISES FERMENTING A NEUTRIENT MEDIUM INITIALLY CONTAINING FROM ABOUT 0.1 TO ABOUT 0.5 GRAM OF L-LYSINE PER LITER, WITH A MUTANT OF E. COLI WHICH INITIALLY REQUIRES L-LYSINE FOR GROWTH, UNDER SUBMERGED, AEROBIC CONDITIONS, ADJUSTING THE PH TO BETWEEN 7.2 AND 8.2, RUPTURING THE CELL WALL OF THE ORGANISM, AND THEN CONTINUING THE REACTION UNDER ANEROBIC CONDITIONS.
References Cited (Backward Citations)
US2771396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |