Oxide or silicate particles of which the hydroxyl groups situated at the surface are at least partly replaced by organic groups, process for their preparation and their use in the destabilization of emulsions and the destruction of foams

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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 May 19, 1984 and granted August 2, 1989. A European patent lasts at most 20 years from filing, so its term ended May 19, 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 November 19, 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.