Cysteine-depleted muteins of biologically active proteins, their preparation, formulations containing them, and structural genes, vectors and organisms, and their production, suitable for use in the preparation of said muteins

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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 October 13, 1983 and granted March 6, 1991. A European patent lasts at most 20 years from filing, so its term ended October 13, 2003.
• 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 April 13, 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.