Process for modifying the surface of a substrate by the formation of an alloy, use of the process, paticularly in the preparation of ferrous alloys, and catalysts and alloys obtained by the process

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 June 21, 1988 and granted December 18, 1991. A European patent lasts at most 20 years from filing, so its term ended June 21, 2008.
• 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 December 21, 2013.
• 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.