Expired European patentEurope
2-Furylbutyrolactone derivatives, their preparation, compositions containing them, and their use for the modulation of the immune system in mammals
EP 0123446 B1 · Applicant: NATIONAL FOUNDATION FOR CANCER RESEARCH, INC.
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
Read the whole patent
Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 26, 1984 and granted May 31, 1989. A European patent lasts at most 20 years from filing, so its term ended March 26, 2004.
- A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by September 26, 2009.
- We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledMarch 26, 1984
PublishedOctober 31, 1984
GrantedMay 31, 1989
Term endedMarch 26, 2004
Application numberEP 84302020
Classification (CPC)C07D493/04 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.