Insoluble yeast extract
CA 2072145 C · Owner: Donzis, Byron A. · Inventors: Donzis, Byron A.; Czop, Joyce K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the production of yeast extract is disclosed wherein yeast cells are initially autoclaved in the presence of an alkaline solution. The residual alkali extracted material is then extracted with an acid. The acid extracted residue is then washed with ethanol. This method of producing yeast extract can be executed in a much shorter time period than previously known methods generally in approximately eight hours. The method yields a glucan product which is substantially free of protein and which is a potent stimulator of macrophage activity.
Read the whole patent
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
- Filed November 2, 1990 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2012.
- 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.