Patents by Inventor Gerd Grah

Gerd Grah 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 O-alkyl, O-alkylphosphorochloridothioates
    Patent number: 5948930
    Abstract: The invention relates to process for the preparation of an O-alkyl, O-alkyl phosphorochloridothioate by 1) reacting A) a thiophosphoryl halide with B) an alcohol, in the presence of C) a tertiary amine acid acceptor and D) a solvent, and 2) reacting the resultant product with a second alcohol, different from the alcohol used in step 1). In the preferred embodiment, the intermediate product is not isolated before reaction with the second alcohol.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: September 7, 1999
    Assignees: Bayer Corporation, Bayer Aktiengesellschaft
    Inventors: David M. Mayes, Daniel M. Wasleski, Gerd Grah, Hermann Seifert
  • Method for regulating the flow of liquid through mass transfer columns
    Patent number: 4045190
    Abstract: A method is provided for controlling the flow of liquid through a column separated by vertically spaced plates into compartments to determine the height of liquid on a plate wherein the liquid is flowed through tubes from compartment to compartment and the rate of flow through the tubes is regulated by a throttle valve responsive to gas pressure below a plate or to the height of liquid in a compartment.
    Type: Grant
    Filed: June 6, 1974
    Date of Patent: August 30, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Artur Judat, Helmut Judat, Gerd Grah