Process for the synthesis of acetic acid, (dimethoxyphosphinyl) ¬¬1,1-dimethylethyl)dimethylsilyl -oxy -,(4-nitrophenyl) methyl ester
CA 2122234 A1 · Owner: Jennings, Mellard N. · Inventors: Blum, David M.; Feigelson, Gregg B.; Green, Kenneth E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title: IMPROVED PROCESS FOR THE SYNTHESIS OF ACETIC ACID, (DIMETHOXYPHOSPHINYL), 1,1-DIMETHYLETHYL) DIMETHYLSILYL- OXY-, (4-NITROPHENYL) METHYL ESTER, ABSTRACT The invention is an improved process for the large scale production of acetic acid, (dimethoxyphosphinyl) 1,1-dimethylethyl) dimethylsilyloxy- (4-nitrophenyl) methyl ester.
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 26, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2016.
- 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.