A catalyst for the selective oxidation of sulfur containing compounds, in particular hydrogen sulfide, to elemental sulfur; a process for the preparation of the catalyst; and a process for the selective oxidation of sulfur containing compounds in particular hydrogen sulfide, to elemental sulfur

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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 April 15, 1987 and granted August 16, 1990. A European patent lasts at most 20 years from filing, so its term ended April 15, 2007.
• 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 October 15, 2012.
• 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.