Method of producing intravenously injectable gamma globulin
CA 1100872 A · Owner: Coval, Myer L. · Inventors: Coval, Myer L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of a gamma globulin fraction suitable for intravenous administration and being substantially free of anti-complementary activity. The process involves extracting a paste or powder of Fraction II or II + III plasma protein or of a placental extraction containing the Fraction with pyrogen-free water at a pH of from 4.9 to 6; separating the extract thus obtained from solid material and treating the extract with polyethylene glycol in an amount of about 4% weight/volume; separating the glycol-treated extract from solid material thus precipitated and subsequently treating with ethanol in an amount of from 4 to 12% weight/volume at …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 12, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 12, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.