Expired Canadian patentCanada
Cephalosporin esters
CA 1069499 A · Owner: Beecham Group Limited · Inventors: Bentley, Peter H.; Clayton, John P.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Phthalidyl and substituted phthalidyl esters of certain cephalosporins are absorbed by the oral route into the serum where, they are hydrolysed to the parent antibacterially active cephalosporin.
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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJanuary 8, 1980
Term endedJanuary 8, 1997
Patent numberCA 1069499 A
Classification (IPC)C07D501/24 +2 more
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.