Process for producing beta-lactamase inhibitor
CA 2016500 C · Owner: Curran, William V. · Inventors: Krishnan, Raghavan; Blum, David; Lee, Ving J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing the compound, 2S-(2.alpha.3.beta.5.alpha.)-3-methyl-7-oxo-3-(1H-1,2,3-triazol-1-ylmethyl)-4-thia-1-azabicyclo3 2 0-heptane-2-carboxylic acid, (4-nitrophenyl)methyl ester, 4,4-dioxide which , comprises reacting a solution of azidopenamsulfone 4-methoxyphenol and vinylpropionate with a solution of bis(trimethylsilyl)acetamide and 4-methoxyphenol in toluene at 80-100°C for 18-30 hours followed by filtering the resulting solution and cooling the filtrate to 0-10°C.
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 May 10, 1990 and granted November 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 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.