US2532403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrogen removal from streptomycin salts
Assignee: Merck and Co Inc
•
Filing: 1946-11-08
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Granted: 1950-12-05
•
Expires: 1966-11-08
Abstract
No abstract record available.
Inventors
- 👤 Eugene E Howe
- 👤 Tishler Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:10
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
THE PROCESS THAT COMPRISES ADDING POWDERED CHARCOAL TO AN AQUEOUS SOLUTION OF APYROGENIC STREPTOMYCIN ACID SALT, AGITATING THE MIXTURE FOR ABOUT ONE HOUR, AND FILTERING OFF THE CHARCOAL, THEREBY RECOVERING A SOLUTION OF THE STREPTOMYCIN ACID SALT FREE OF PYROGENS.
Claim 2
Dependent Claim
40 words
THE PROCESS THAT COMPRISES ADDING POWDERED CHARCOAL TO AN AQUEOUS SOLUTION OF APYROGENIC STREPTOMYCIN ACID SALT, AGITATING THE MIXTURE FOR ABOUT ONE HOUR, AND FILTERING OFF THE CHARCOAL, THEREBY RECOVERING A SOLUTION OF THE STREPTOMYCIN ACID SALT FREE OF PYROGENS.
References Cited (Backward Citations)
US2446102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |