Mutant actinosynnema pretiosum strain with increased maytansinoid production
CA 2474639 C · Owner: Byng, Graham S. · Inventors: Byng, Graham S.; Chung, Johnson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microorganism that is a mutant bacterial strain of the species Actinosynnema pretiosum, designated PF4-4, (ATCC PTA-3921) being capable of producing , maytansinoid ansamitocins such as ansamitocin P-3 in improved yield compared to previous known strains, and capable of growth under varied culture conditions, and methods of producing maytansinoid ansamitocins by culturing PF4-4 in a suitable growth medium.
Read the whole patent
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 15, 2003 and granted August 4, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 15, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 2025.
- 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.