Process for 1-carba(dethia)cephalosporins
CA 1338785 C · Owner: Blaszczak, Larry Chris · Inventors: Blaszczak, Larry Chris
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a free radical process for preparing 1-carba(1-dethia)cephalosporin antibiotics with 2-substituted methylcephalosporin 1,1dioxides wherein the substituent on the 2-methylene group is a free radical precursor group such as a phenyl or alkylseleno group. The latter dioxides are treated with a free radical initiator, e.g. a trialkyltin hydride or actinic radiation at 40°C to 150°C to provide the 1-carba-3-cephem and 1-carba-2-cephem products. The invention also provides free radical compounds formed as intermediates in the process.
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 December 10, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2013.
- 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.