Expired Canadian patentCanada
Extraction of human interleukin-4 from bacteria
CA 1314831 C · Owner: Alroy, Yair · Inventors: Leibowitz, Paul; Alroy, Yair
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for extracting human interleukin-4 (IL-4) from IL-4 expressing bacterial cells. The method comprises treating the bacterial cells with a deactivating agent, disrupting the cell and recovering the IL-4. P/PASP3337
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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 March 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 23, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 16, 1989
GrantedMarch 23, 1993
Term endedMarch 23, 2010
Patent numberCA 1314831 C
Classification (IPC)C12N1/06 +2 more
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.