Chroman derivatives
CA 2178479 C · Owner: Akaike, Masashi · Inventors: Akaike, Masashi; Shudo, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chroman derivative represented by general formula (I) and a vitamin-E-like active substance containing the same as the active ingredient wherein X , represents H, -CH2OH-, -CHO -COOH, -COOCH3, -CH=NOH, -CONH2, -COCH3 -, CH(OH)CH3, Br or -CN; Y represents optionally protected hydroxy; and R represents alkyl, alkenyl or aralkyl, provided R represents C16 or higher alkyl, alkenyl or aralkyl when X represents hydrogen.
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 December 6, 1994 and granted February 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2016.
- 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.