Patents by Inventor Volker Weintritt

Volker Weintritt 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).

  • Process for recovering polysocyanates from the distillation residues obtained in the production of tolylene diisocyanate
    Patent number: 5314588
    Abstract: A process for recovering a distillate of tolylene diisocyanate and an isocyanate-group-containing sump product containing less than 200 ppm (by weight) tolylene diisocyanate from A) distillation residues obtained in the production of tolylene diisocyanate by mixing of the distillation residues A) with B) optionally urethane- and/or allophanate-modified polyisocyanates or polyisocyanate mixtures of the diphenyl methane series, heating of the mixture to 190.degree. to 250.degree. C. and simultaneously or subsequently working up by distillation.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: May 24, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe J. Zarnack, Volker Weintritt, Christian Konig