US3798320A
Expired / Lapsed
US
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Precipitation of bacterial cells with polymers
Assignee: South African Inventions Development Corp
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Filing: 1971-09-09
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Granted: 1974-03-19
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Expires: 1991-09-09
Abstract
Abstract BACTERIA ARE RENDERED INDISPERSABLE IN AQUEOUS MEDIUM, E.G. AQUEOUS CULTURE FLUID BY MEANS OF A LINEAR FILAMENTARY NON-CHARGED POLYMER PERCIPITANT, PREFERABLY A POLYALKYLENE GLYCOL SUCH AS PEG WITHIN THE PREFERRED MOLECULAR WEIGHT RANGE OF 2,000 TO 3,000. THE INVENTION CAN BE APPLIED TO A WIDE RANGE OF APPLICATIONS IN THE FIELD OF IMMULOGY, PARTICULARLY IN THE MANUFACTURE OF VACCINES. BACTERIAL MATTER CAN BE CONCERNED AS A USEFUL PRODUCT OR REMOVED FROM OTHER SUBSTANCES, E.G. TOXINS TO PURIFY THE LATTER. THUS, I.A. NOVEL VACCINE AGAINST PULPY KIDNEY DISEASE IS PRODUCED, CONTAINING THE IMMUNOLOGICALLY VALUABLE TOXOIDS FREE OF BACTERIA CELLS.
Inventors
- 👤 K Weiss
- 👤 C Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:31
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/02; A; A61; A61K; A61K39/00; Y; Y10; Y10S; Y10S435/00; Y10S435/803; Y10S435/8215; Y10S435/822; Y10S435/842; Y10S435/879
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |