Patents by Inventor Andreas Ruhmkorff

Andreas Ruhmkorff 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).

  • Electric toothbrush
    Patent number: 5987681
    Abstract: An electric toothbrush with a handle, a brush head and a shank which connects the handle to the brush head. A rotary motor is arranged in the handle and drives an unbalanced mass. The unbalanced mass driven by the motor is supported on one side or on both sides in the shank close to the brush head and is driven via an extended drive shaft, preferably an intermediate shaft, by the motor.
    Type: Grant
    Filed: December 31, 1997
    Date of Patent: November 23, 1999
    Assignee: Rowenta -Werke GmbH
    Inventors: Matthias Hahn, Klaus Hofer, Andreas Ruhmkorff