Patents by Inventor Helmut W. Droge

Helmut W. Droge 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 producing thiocyanatopropyltriethoxysilane
    Patent number: 6005129
    Abstract: After a solution of chloropropyltriethoxysilane and sodium thiocyanate react in ethanol to form a thiocyanatopropyltriethoxysilane suspension, salt resulting from the reacting step is removed from the ethanol-containing centrifugate and washed. The first embodiment for manufacturing thiocyanatopropyltriethoxysilane includes adding the wash ethanol to the solution in the reacting step, distilling the centrifugate to remove ethanol, and removing solids from a thiocyanatopropyltriethoxysilane residue resulting from the distilling step. The ethanol from the distilling step may be used to wash the salt separated in the centrifugating step.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: December 21, 1999
    Assignee: Degussa Corporation
    Inventors: Helmut W. Droge, Hui-Li Yang