Process for preparing adipic acid
CA 2114635 C · Owner: Ide, Tohru · Inventors: Yokota, Masahisa; Ide, Tohru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for preparing adipic acid from cyclohexene oxide, cyclohexene oxide is hydrated to prepare 1,2-dihydroxycyclohexane and oligomers represented by formula (I):, (see formula I), wherein n represents a number of from 1 to 5 and then a mixture comprising the oligomer represented by formula (I) and/or 1,2-dihydroxycyclohexane and/or cyclohexene oxide is oxidized in a nitric acid aqueous solution to prepare the adipic acid with industrial advantages.
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 April 9, 1993 and granted May 23, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.