US2656347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Streptomycin broth clarification with sequestering agents
Assignee: Pfizer Inc
•
Filing: 1949-08-25
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Granted: 1953-10-20
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Expires: 1969-08-25
Abstract
No abstract record available.
Inventors
- 👤 John J Goett
- 👤 Stanley W Ensminger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:09
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238; C12; C12R; C12R2001/00; C12R2001/01; C12R2001/465; Y; Y10; Y10S; Y10S424/00; Y10S424/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
IN AN IMPROVED METHOD FOR THE RECOVERY OF A NITROGEN BASIC ANTIBIOTIC FROM STREPTOMYCES FORMENTATION BROTH CONTAINING MULTIVALENT METALLIC IONS, THE STEP WHICH COMPRISES ADDING A SEQUESTERING AGENT WHICH FORMS COMPLEXES WITH CALCIUM TO THE BROTH PRIOR TO THE ISOLATION OF THE NITROGEN BASIC ANTIBIOTIC.
Claim 2
Dependent Claim
45 words
IN AN IMPROVED METHOD FOR THE RECOVERY OF A NITROGEN BASIC ANTIBIOTIC FROM STREPTOMYCES FORMENTATION BROTH CONTAINING MULTIVALENT METALLIC IONS, THE STEP WHICH COMPRISES ADDING A SEQUESTERING AGENT WHICH FORMS COMPLEXES WITH CALCIUM TO THE BROTH PRIOR TO THE ISOLATION OF THE NITROGEN BASIC ANTIBIOTIC.
References Cited (Backward Citations)
US2541420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |