Antibiotic carbapenem derivatives
CA 2107675 C · Owner: Zeneca Limited · Inventors: Breault, Gloria A.; Betts, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a compound of formula (1) wherein: R1 is Ihydroxyethyl, 1-fluoroethyl or hydroxymethyl; R2 is hydrogen or C1-4alkyl; R3 and R4 are ortho with respect to one another wherein R3 and R4 are independently hydroxy or in vivo hydrolysable esters thereof; the benzene ring being optionally further substituted; or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof.
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 April 2, 1992 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2014.
- 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.