US3790552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing hepatitis-associated antigen from a protein fraction using polyethylene glycol
Assignee: United States Department of Health and Human Services
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Filing: 1972-03-16
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Granted: 1974-02-05
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Expires: 1992-03-16
Abstract
Abstract A METHOD OF REMOVING HEPATITIS-ASSOCIATED ANTIGEN FROM A PROTEIN FRACTION BY REGULATING PROTEIN CONCENTRATION, IONIC STRENGTH OF THE SOLUTION, AND PH, AND FRACTIONATING THE MIXTURE BY THE USE OF POLYETHYLENE GLYCOL IN A PARTICULAR CONCENTRATION RANGE IS DISCLOSED. THE PH OF THE SOLUTION SHOULD BE REMOVED FROM THE ISOELECTRIC POINT OF THE MATERIAL BEING PRECIPITATED.
Inventors
- 👤 A Johnson
- 👤 J Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:50
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/005; C12; C12N; C12N2730/00; C12N2730/00011; C12N2730/10011; C12N2730/10111; C12N2730/10122; Y; Y10; Y10S; Y10S530/00; Y10S530/806; Y10S530/827; Y10S530/829; Y10S530/83; Y10S530/831
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |