US2937122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of l-threonine
Assignee: Pfizer Inc
•
Filing: 1958-03-10
•
Granted: 1960-05-17
•
Expires: 1978-03-10
Abstract
No abstract record available.
Inventors
- 👤 Hsing T Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
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
89 words
A PROCESS FOR THE PREPARATION OF L-THREONINE WHICH PROCESS COMPRISES CULTIVATING UNDER SUBMERGED AEROBIC CONDITIONS AT A PH OF FROM ABOUT 6 TO ABOUT 8 E. COLI, ATCC 13070, IN AN AQUEOUS NUTRIENT MEDIUM COMPRISING A HEXITOL SELECTED FROM THE GROUP CONSISTING OF SORBITOL AND MANNITOL, A SOURCE OF NITROGEN, A SOURCE OF MAGNESIUM, A SOURCE OF POTASSIUM AND TRACE METALS IN THE PRESENCE OF FROM ABOUT 150 TO ABOUT 200 MG. OF DIAMINOPIMELIC ACID AND FROM ABOUT 15 TO 100 MG. OF LMETHIONINE PER LITER OF NUTRIENT MEDIUM.
Claim 2
Dependent Claim
89 words
A PROCESS FOR THE PREPARATION OF L-THREONINE WHICH PROCESS COMPRISES CULTIVATING UNDER SUBMERGED AEROBIC CONDITIONS AT A PH OF FROM ABOUT 6 TO ABOUT 8 E. COLI, ATCC 13070, IN AN AQUEOUS NUTRIENT MEDIUM COMPRISING A HEXITOL SELECTED FROM THE GROUP CONSISTING OF SORBITOL AND MANNITOL, A SOURCE OF NITROGEN, A SOURCE OF MAGNESIUM, A SOURCE OF POTASSIUM AND TRACE METALS IN THE PRESENCE OF FROM ABOUT 150 TO ABOUT 200 MG. OF DIAMINOPIMELIC ACID AND FROM ABOUT 15 TO 100 MG. OF LMETHIONINE PER LITER OF NUTRIENT MEDIUM.
References Cited (Backward Citations)
US2771396A
Cited
US2841532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |