Expired European patentEurope
Process for the treatment of spent aqueous solutions of caustic soda used for purification and washing of petroleum products
EP 0509964 B1 · Applicant: ECOTEC S.r.l.
Overview
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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 January 27, 1992 and granted August 3, 1994. A European patent lasts at most 20 years from filing, so its term ended January 27, 2012.
- 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 July 27, 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.
FiledJanuary 27, 1992
PublishedOctober 21, 1992
GrantedAugust 3, 1994
Term endedJanuary 27, 2012
Application numberEP 92830030
Classification (CPC)C10G19/08
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.