Preparation of 3-methoxymethylcephalosporins
CA 1064909 A · Owner: Eli Lilly And Company · Inventors: Wright, Ian G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a novel process for preparing 3-methoxymethylcephalosporin acids by reacting a 3-hydroxymethylcephalosporin acid with a reagent selected from the group consisting of trifluoroacetic anhydride, phosphorus trichloride, phosphorus oxychloride and, thionyI chloride, and reacting the resulting intermediate with methanol.
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 October 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 23, 1996.
- 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.