Variant proteins and polypeptides possessing enhanced affinity for immobilized-metal affinity matrices
CA 2021722 C · Owner: Krivi, Gwen G. · Inventors: Haymore, Barry L.; Bild, Gary S.; Krivi, Gwen G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed at variant proteins and polypeptides having an enhanced affinity i.e. greater binding strength, for immobilized-metal affinity resins and resides in engineering one or more specific metal-chelating amino acid sequences into a protein or polypeptide, the specific sequence depending on the metal-binding amino acids utilized and the secondary structure associated with the portion of the protein or polypeptide to include such sequence.
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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
- Filed July 20, 1990 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 20, 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
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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.