Process for producing 1,4-dihydroxy-2-naphthoic acid
CA 2457055 C · Owner: Sato, Yoshiro · Inventors: Furuichi, Keisuke; Kamiyama, Tomonori; Ikegami, Shuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition containing 1,4-dihydroxy-2-naphthoic acid at a high concentration is obtained by intracellularly and extracellularly producing 1,4dihydroxy-2-naphthoic acid using a bacterium belonging to the genus Propionibacterium and collecting it. This composition is efficacious in improving enteric flora, relieving abdominal unpleasantness in association with the intake of milk and preventing metabolic bone diseases.
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 August 6, 2002 and granted October 8, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2024.
- 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.