Process for the preparation of 2-hydroxyarylaldehydes
CA 2076235 C · Owner: Levin, Daniel · Inventors: Levin, Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the preparation of a 2-, hydroxyarylaldehyde which comprises reacting a magnesium bis-hydrocarbyloxide derived at least in part from a hydroxyaromatic compound having at least one free position ortho to the hydroxyl group with formaldehyde or formaldehyde-liberating compound under substantially anhydrous conditions.
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 17, 1992 and granted September 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2014.
- 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.