US3419472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing streptokinaserich material
Assignee: Wyeth Holdings LLC
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Filing: 1965-09-20
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Granted: 1968-12-31
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Expires: 1985-09-20
Abstract
No abstract record available.
Inventors
- 👤 Siiteri Pentti Kasper
- 👤 Mills Richard Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/195; C07K14/315; C07K14/3153; A; A61; A61K; A61K38/00; Y; Y10; Y10S; Y10S435/00; Y10S435/814; Y10S435/815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A ONE-CYCLE ABSORPTION-ELUTION PROCESS FOR PREPARING STREPTOKINASE-RICH MATERIAL FROM RELATIVELY IMPURE SOURCES THEREOF WHICH CONSISTS IN THE STEPS OF (A) ADSORBING CRUDE STREPTOKINASE ONA CELLULOSE AMINE ANION EXCHANGE AND (B) DESORBING PURIFIED STREPTOKINASE THEREFROM BY MEANS OF ELUTION, SAID PROCEEDING STEPS TAKING PLACE IN THE PRESENCE OF A SAID PRECEEDING BUFFER SYSTEM HAVING A PH VALUE OF NOT LESS THAN ABOUT 5.8 AND NOT MORE THAN ABOUT 8.5, A TEMPERATURE OF NOT LESS THAN 0*C. AND NOT MORE THAN ABOUT 10*C., AND A MOLARITY OF NOT LESS THAN ABOUT 0.1 AND DURING SAID DESORBING STEP OF NOT MORE THAN ABOUT 0.4, AND RECOVERING THE STREPTOKINASE-RICH MATERIAL FROM THE ELUATE.
Claim 2
Dependent Claim
109 words
A ONE-CYCLE ABSORPTION-ELUTION PROCESS FOR PREPARING STREPTOKINASE-RICH MATERIAL FROM RELATIVELY IMPURE SOURCES THEREOF WHICH CONSISTS IN THE STEPS OF (A) ADSORBING CRUDE STREPTOKINASE ONA CELLULOSE AMINE ANION EXCHANGE AND (B) DESORBING PURIFIED STREPTOKINASE THEREFROM BY MEANS OF ELUTION, SAID PROCEEDING STEPS TAKING PLACE IN THE PRESENCE OF A SAID PRECEEDING BUFFER SYSTEM HAVING A PH VALUE OF NOT LESS THAN ABOUT 5.8 AND NOT MORE THAN ABOUT 8.5, A TEMPERATURE OF NOT LESS THAN 0*C. AND NOT MORE THAN ABOUT 10*C., AND A MOLARITY OF NOT LESS THAN ABOUT 0.1 AND DURING SAID DESORBING STEP OF NOT MORE THAN ABOUT 0.4, AND RECOVERING THE STREPTOKINASE-RICH MATERIAL FROM THE ELUATE.
References Cited (Backward Citations)
US3226304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |