Patent US3033753A successfully refreshed from Google Patents.
US3033753A
Expired / Lapsed
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Erythropoietic factor purification
Assignee: Individual
•
Filing: 1959-08-31
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Granted: 1962-05-08
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Expires: 1979-08-31
Abstract
No abstract record available.
Inventors
- 👤 Wilfrid F White
- 👤 Robert J Schlueter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:07
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/435; C07K14/475; C07K14/505; A; A61; A61K; A61K38/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN THE METAHOD OF PURIFYING THE ERYTHROPOIETIC FACTOR WHEREIN ANEMIC SHEEP BLOOD PLASMA IS PUT INTO CONTACT WITH AN ANION EXCHANGE RESIN, AND THEN WITH A CATION EXCHANGE RESIN AT A PH OF ABOUT 6.0, THE IMPROVENEMT CONSISTING OF BRINGING A SOLUTION CONTAINING THE FACTOR INTO CONTACT WITH A CATION EXCHANGE MATERIAL AT A PH OF 5.0-5.3 DURING SAID CONTACT.
Claim 2
Dependent Claim
60 words
IN THE METAHOD OF PURIFYING THE ERYTHROPOIETIC FACTOR WHEREIN ANEMIC SHEEP BLOOD PLASMA IS PUT INTO CONTACT WITH AN ANION EXCHANGE RESIN, AND THEN WITH A CATION EXCHANGE RESIN AT A PH OF ABOUT 6.0, THE IMPROVENEMT CONSISTING OF BRINGING A SOLUTION CONTAINING THE FACTOR INTO CONTACT WITH A CATION EXCHANGE MATERIAL AT A PH OF 5.0-5.3 DURING SAID CONTACT.
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |