Patent US2973304A successfully refreshed from Google Patents.
US2973304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fermentation process
Assignee: Pfizer Inc
•
Filing: 1958-10-02
•
Granted: 1961-02-28
•
Expires: 1978-10-02
Abstract
No abstract record available.
Inventors
- 👤 Hsing T Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:02
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; C12P13/22; C12P13/222; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/848; Y10S435/849
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR THE PRODUCTION OF L-PHENYLALANINE WHICH PROCESS COMPRISES CULTIVATING UNDER SUBMERGED. AEROBIC CONDITIONS AT A PH FROM ABOUT 6.0 TO ABOUT 8.0 E. COLI, ATCC 13281, IN AN AQUEOUIS NUTRIENT MEDIUIM COMPRISING A CARBON SOURCE SELECTED FROM THE GROUP CONSISTING OF GLYCEROL, SORBITOL, MANNITOL, SUCROSE AND MIXTURES THEREOF, A SOURCE OF NITROGEN, A SOURCE OF MAGNESIUM, POTASSIUM, AND TRACE METALS IN THE PRESENCE OF FROM ABOUT 10 TO ABOUT 200 MILLIGRAMS OF L-TYROSINE PER LITER OF NUTRIENT MEDIUM.
Claim 2
Dependent Claim
80 words
A PROCESS FOR THE PRODUCTION OF L-PHENYLALANINE WHICH PROCESS COMPRISES CULTIVATING UNDER SUBMERGED. AEROBIC CONDITIONS AT A PH FROM ABOUT 6.0 TO ABOUT 8.0 E. COLI, ATCC 13281, IN AN AQUEOUIS NUTRIENT MEDIUIM COMPRISING A CARBON SOURCE SELECTED FROM THE GROUP CONSISTING OF GLYCEROL, SORBITOL, MANNITOL, SUCROSE AND MIXTURES THEREOF, A SOURCE OF NITROGEN, A SOURCE OF MAGNESIUM, POTASSIUM, AND TRACE METALS IN THE PRESENCE OF FROM ABOUT 10 TO ABOUT 200 MILLIGRAMS OF L-TYROSINE PER LITER OF NUTRIENT MEDIUM.
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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |