Patents by Inventor Gerhard Kuenstle

Gerhard Kuenstle 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 isolating pure diketene with recovery of materials of value
    Patent number: 5370774
    Abstract: The invention relates to a process for isolating pure diketene with recovery of materials of value by continuous, two-stage distillation of crude diketene at reduced pressure and with continuous reaction of the resulting distillation residue with acetic acid, pure diketene and acetic anhydride being separated off by means of the two-stage distillation. In the stabilization of the distillation residue with acetic acid, reutilizable acetic acid, which contains acetone with or without acetic anhydride, is recovered.
    Type: Grant
    Filed: November 3, 1993
    Date of Patent: December 6, 1994
    Assignee: Wacker-Chemie GmbH
    Inventors: Gerhard Kuenstle, Alois Maier