Patents by Inventor Robert Christa

Robert Christa 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 preparing polydimethylsiloxanes
    Patent number: 5476916
    Abstract: The present invention describes a process wherein dimethyldichlorosilane is reacted, in a first step, with water present in hydrochloric acid to give a crude hydrolysate comprising cyclic and linear, chlorine-containing polydimethylsiloxanes and gaseous hydrogen chloride and, in a second step, the crude hydrolysate is treated with steam to reduce the chlorine content and form hydrochloric acid, with the hydrochloric acid formed in the second step being used in the first step.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: December 19, 1995
    Assignee: Wacker-Chemie GmbH
    Inventors: Bernd Pachaly, Gerhard Nagy, Wolfgang Jacques, Robert Christa