US3630840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying solutions of the foot-and-mouth disease virus
Assignee: Bayer AG
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Filing: 1970-03-13
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Granted: 1971-12-28
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Expires: 1990-03-13
Abstract
Abstract Foot-and-mouth disease virus solutions, used for the preparation of vaccines against the disease, are freed of undesirable protein contaminants accompanying the virus particles by subjecting the impure solution to fractional precipitation with polyethylene glycol solutions. The precipitate, containing the virus intigens is separated from the liquid phase which contains the proteins, preferably by centrifuging. The sediment consists of substantially purified virus antigen.
Inventors
- 👤 Otto Wagner
- 👤 Horst Geilhausen
- 👤 Hans Bahnemann
- 👤 Otto-Erich Schweckendiek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:05
CPC Classifications
C; C12; C12N; C12N7/00; A; A61; A61K; A61K39/00; A61K39/12; A61K39/125; A61K39/135; C12N2770/00; C12N2770/00011; C12N2770/32011; C12N2770/32111; C12N2770/32134; C12N2770/32151; Y; Y10; Y10S; Y10S530/00; Y10S530/806; Y10S530/82; Y10S530/826
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
The process of claim 1 carried out at a temperature between 0* C. and room temperature.
Claim 2
Dependent Claim
22 words
The process of claim 1 carried out at a pH of about 8.5 and a temperature of from 4* to 5* C.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein after addition of the polyethylene glycol solution the mixture is permitted to stand for 12 to 60 hours, then separating the precipitate by centrifuge.
References Cited (Backward Citations)
US3415804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |