Process for producing 6-hydroxy-2-naphthoic acid
CA 1267911 C · Owner: Yamauchi, Takashi · Inventors: Hayashi, Shoichiro; Yamauchi, Takashi; Tanonaka, Takayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a process for producing 6-hydroxy-2-naphthoic acid which is used as a monomer for producing aromatic polyesters having an ability of forming liquid crystals, comprising oxidizing 2-(2hydroxy-2-propyl)naphthalene-6-carboxylic acid or a mixture of 2-(2-hydroxy-2-propyl)naphthalene-6-carboxylic acid and 2-(2-hydroperoxy-2-propyl)naphthalene-6carboxylic acid by hydrogen peroxide in acetonitrile and/or dioxane in the presence of an inorganic acid.
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
- Granted April 17, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 2007.
- 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.