US2666729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying streptokinase
Assignee: Merck and Co Inc
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Filing: 1951-06-14
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Granted: 1954-01-19
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Expires: 1971-06-14
Abstract
No abstract record available.
Inventors
- 👤 Baumgarten Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:12
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/195; C07K14/315; C07K14/3153; Y; Y10; Y10S; Y10S435/00; Y10S435/814; Y10S435/815; Y10S435/8215; Y10S435/822; Y10S435/885
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE PROCESS OF CONCENTRATING AND PURIFYING STREPTOKINASE FROM A CULTURE BROTH CONTAINING STREPTOKINASE WHICH COMPRISES ADJUSTING THE PH OF THE BROTH TO WITHIN THE PH RANGE OF 3.5 TO 5.0, ADMIXING THEREWITH A DIATOMACEOUS EARTH, SEPARATING THE DIATOMACEOUS EARTH FROM THE BROTH, ADMIXING THE DIATOMACEOUS EARTH WITH AN ALKALINE SOLUTION AT PH 7.0 TO 8.0 AND SEPARATING THE SOLUTION FROM THE DIATOMACEOUS EARTH.
Claim 2
Dependent Claim
63 words
THE PROCESS OF CONCENTRATING AND PURIFYING STREPTOKINASE FROM A CULTURE BROTH CONTAINING STREPTOKINASE WHICH COMPRISES ADJUSTING THE PH OF THE BROTH TO WITHIN THE PH RANGE OF 3.5 TO 5.0, ADMIXING THEREWITH A DIATOMACEOUS EARTH, SEPARATING THE DIATOMACEOUS EARTH FROM THE BROTH, ADMIXING THE DIATOMACEOUS EARTH WITH AN ALKALINE SOLUTION AT PH 7.0 TO 8.0 AND SEPARATING THE SOLUTION FROM THE DIATOMACEOUS EARTH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |