L-ascorbic acid production in microorganisms
CA 2091918 C · Owner: Huss, Ronald J. · Inventors: Running, Jeffrey A.; Huss, Ronald J.; Skatrud, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved heterotrophic biosynthetic production of ascorbic acid is obtained using ascorbic acid-producing microalgae in particular of the genus Chlorella and the genus Prototheca, as the microorganism source and growing the culture undera controlled pattern of carbon source supply. Greatly improved ratios of ascorbic acid to total carbon source supplied as well as enhanced concentrations of ascorbic acid in the fermentor are obtained. C. pyrenoidosa UV 101-158 was deposited at the A.T.C.C. on June 27, 1985 and given Accession No. 53170.
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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 March 18, 1993 and granted July 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2015.
- 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.