Expired European patentEurope
Process for activating the surface of heavy metal carbides having an increased specific surface for catalytic reactions
EP 0474570 B1 · Applicant: PECHINEY RECHERCHE (Groupement d'Intérêt Economique géré par l'ordonnance du 23 Septembre 1967)
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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 September 4, 1991 and granted May 10, 1995. A European patent lasts at most 20 years from filing, so its term ended September 4, 2011.
- 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 March 4, 2017.
- 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.
FiledSeptember 4, 1991
PublishedMarch 11, 1992
GrantedMay 10, 1995
Term endedSeptember 4, 2011
Application numberEP 91420312
Classification (CPC)B01J37/08 +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.