Chondroitin lyase enzymes
CA 2194375 C · Owner: Laliberte, Maryse · Inventors: Fink, Dominique; Bennett, D. Clark; Tkalec, Anna Lydia
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention describes a method for the production of two highly purified enzymes capable of degrading chondroitin sulfate polysaccharides. A multi-step purification method incorporating cell disruption cation exchange , chromatography, affinity chromatography hydroxylapatite chromatography, high , resolution ion exchange chromatography and size exclusion is outlined. A 77,000 ~ 5,000 Dalton protein capable of degrading chondroitin sulfates A and C and a 55,000 ~ 2,300 Dalton protein capable of degrading dermatan sulfate were isolated. The genes encoding these enzymes chondroitinase AC and , chondroitinase B respectively, have been cloned and methods for their use are …
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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 7, 1995 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2017.
- 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.