Expired Canadian patentCanada
Bis(phenyl)ethane derivatives
CA 2080555 C · Owner: Nussbaumer, Peter · Inventors: Nussbaumer, Peter; Stuetz, Anton
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns the compounds of formula I (see Formula I), wherein R1 and R2 independently are alkoxy R3 is hydrogen, or acyl and R4 is alkoxy. The compounds have potent antihyperproliferative/antiinflammatory and anticancer activity.
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 October 14, 1992 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 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.
FiledOctober 14, 1992
GrantedDecember 30, 2003
Term endedOctober 14, 2012
Patent numberCA 2080555 C
Classification (IPC)C07C69/94 +1 more
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.