Patents by Inventor Birgit Froehlich

Birgit Froehlich 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).

  • Cleaning preparations for hard surfaces
    Patent number: 4863629
    Abstract: Aqueous cleaning preparations for hard surfaces containing surfactants and from 1 to 20% by weight propylene glycol tert.-butyl ether as an essential component.
    Type: Grant
    Filed: April 20, 1988
    Date of Patent: September 5, 1989
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Rainer Osberghaus, Karl-Heinz Rogmann, Birgit Froehlich