Patents by Inventor Hans D. Winkelmann

Hans D. Winkelmann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Halogenated aromatic amines which are stable in color, and a process for their preparation
    Patent number: 4350573
    Abstract: Halogenated aromatic amines are rendered colorstable by distillation and/or storing in equipment made of a rustproof material such as a Cr/Ni/Mo steel, tin, zinc, enamel, glass and/or ceramic material.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: September 21, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmuth Kritzler, Walter Bohm, Ulrich Kappler, Hans D. Winkelmann
  • Isocyanate adduct diols
    Patent number: 4211699
    Abstract: Isocyanate adduct diols of the formulaM--CO--NH--D'--NH--CO--Ain which M is derived from an amino diol or a hydrazino diol, D' represents the divalent radical of an organic diisocyanate, and A is an isocyanate masking group; and a process for their production.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: July 8, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans D. Winkelmann, Karlheinz Wolf, Harald Oertel, Norbert Weimann
  • Self-crosslinkable polyurethanes
    Patent number: 4153775
    Abstract: Process for the production of solutions of segmented self-crosslinkable polyurethanes by incorporating in the polymer chain segments of the general formulaM--CO--NH--D'--NH--CO--A,wherein D' is the divalent residue of an organic diisocyanate; M is a diol containing residue derived by reaction of the active N-hydrogen of an aminodiol or a hydrazinodiol which contains a primary or secondary amino group, with an isocyanate group; and A is an isocyanate masking group.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: May 8, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans D. Winkelmann, Karlheinz Wolf, Harald Oertel, Norbert Weimann