US4255520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a rabies vaccine and vaccine obtained by this process
Assignee: Cilag GmbH International
•
Filing: 1980-04-02
•
Granted: 1981-03-10
•
Expires: 2000-04-02
Abstract
Abstract A method for preparing a rabies vaccine wherein rabies viruses are multiplied in poultry embryos, the heads of the embryos are harvested and the cell extract containing the rabies antigens is separated therefrom for differential centrifugation and density gradient centrifugation, the separated antigen is further processed using conventional methods. This process results in a highly selective concentration of antigens and the production of viruses having a very high activity and freedom from contaminating proteins.
Inventors
- 👤 Klaus R. Schell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:48
CPC Classifications
A; A61; A61K; A61K39/00; A61K39/12; A61K39/205; C; C12; C12N; C12N7/00; A61K2039/51; A61K2039/525; A61K2039/5252; C12N2760/00; C12N2760/00011; C12N2760/20011; C12N2760/20111; C12N2760/20134; C12N2760/20151
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
In a method for the preparation of rabies vaccine wherein rabies viruses are multiplied in poultry embryos, the embryos are harvested and a cell extract containing the rabies antigen is separated therefrom and processed for use, the improvement which comprises harvesting only the heads of the embryos and separating the antigen by differential centrifugation and density gradient centrifugation.
Claim 2
Dependent Claim
58 words
In a method for the preparation of rabies vaccine wherein rabies viruses are multiplied in poultry embryos, the embryos are harvested and a cell extract containing the rabies antigen is separated therefrom and processed for use, the improvement which comprises harvesting only the heads of the embryos and separating the antigen by differential centrifugation and density gradient centrifugation.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the embryos are duck embryos, chicken embryos, or quail embryos.
Claim 4
Dependent Claim
41 words
The method of claim 1 or 2 wherein the differential centrifugation is carried out at about 10,000 to 15,000 xg and the density gradient centrifugation is carried out at 75,000 to 90,000 xg in increasing sugar concentrations and in buffer solution.
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |