Oxidation of dialkyl polyaromatics to dicarboxypolyaromatics
CA 2050866 A1 · Owner: Monsanto Company · Inventors: Schaefer, George F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of polyaromatic acids is disclosed in which the alkyl substituents of an alkyl substituted poly-aromatic compound are oxidized with an oxygen containing gas in the presence of a catalytic amount of a halogen-free metal catalyst composition, the oxidation being carried out in an organic aliphatic carboxylic acid solvent having from 2 to about 7 carbon atoms.
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 September 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 6, 2013.
- 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.