Process for the preparation of aqueous dispersions or solutions of polyurethane polyureas containing thermally activatable cross-linkers, the dispersions or solutions thus obtained, and their use in the production of coatings

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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 13, 1982 and granted January 21, 1987. A European patent lasts at most 20 years from filing, so its term ended September 13, 2002.
• 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 13, 2008.
• 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.