Quinone derivatives and pharmacological use
CA 2024479 C · Owner: Nagakawa, Junichi · Inventors: Tagami, Katsuya; Abe, Shinya; Miyamoto, Kaname
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel quinone compounds and salts thereof are disclosed which are in the treatment of hepatic diseases. The novel compounds are defined by the formula:, wherein A is a group represented by the formula: (wherein R3, R4 and R5 which may be the same or different from each other are each a hydrogen atom a lower alkyl group or a lower alkoxy group) or a group represented by the formula:,
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 31, 1990 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2012.
- 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.