Process for preparation of .alpha.-alkoxy acetic acids and their salts
CA 2019230 A1 · Owner: Mueller, Richard A. · Inventors: Campbell, Arthur L.; Mueller, Richard A.; Partis, Richard A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing an .alpha.-alkoxy acetic acids and salts thereof which comprises reacting an alcohol of the formula R-OH wherein R is alkyl, substituted alkyl or, cycloalkyl, or cycloalkyl alkyl with a base in an aprotic organic solvent to give an alkoxide followed by removal of the organic solvent and reaction of the alkoxide with a salt of a monohaloacetic acid in a polar aprotic solvent such as DMSO to give the corresponding alkoxyacetate salt which then may be recovered or may optionally be converted to the corresponding acid by contacting the alkoxy acetate salt with an 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
- Filed June 18, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2012.
- 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.