Improved mutants of (2,5-dkg) reductase
CA 2242965 A1 · Owner: Powers, David B. · Inventors: Anderson, Stephen; Powers, David B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mutants of 2,5-diketo-D-gluconic acid reductase A and B enzymes used to , produce 2-keto-L-gulonic acid a precursor of ascorbic acid (vitamin C) are , prepared by site-directed mutagenesis. These mutants may exhibit one or more of the following characteristics: improved temperature stability increased , resistance to substrate inhibition increased turnover of the substrate by the enzyme and increased affinity for the substrate.
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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 January 9, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 2019.
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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.