Process for the manufacture of cephalosporins
CA 1204437 A · Owner: I.C.I Pharma · Inventors: Bruneau, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of 7-(imidazol- 2-yl)amino-3-(H-1,2,3-triazol-4-yl)thiomethylceph-3-em- 4-carboxylic acid, and the acid- and base-addition salts thereof, characterised by reaction of a compound of the formula I:-, I, in which R1 is a displaceable radical with 4-mercapto- 1H-1,2,3-triazole or a base-addition salt thereof in a diluent or solvent consisting of trifluoroacetic acid trichloroacetic acid, acetonitrile or sulpholane or a mixture of any two or three of these in the, presence of boron trifluoride or a complex thereof; whereafter when the product is obtained as the free base or the salt, and the salt or free base respectively is required, the interconversion between …
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
- Granted May 13, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 2003.
- 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.