Patents by Inventor Alfred Matthies

Alfred Matthies 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).

  • Pneumatic brake
    Patent number: 4173301
    Abstract: A pneumatic brake device for use in electrostatic copier devices to impart a drag to paper moving through the device. The brake device includes a housing having a perforated suction surface functioning as a brake surface. In order to reduce suction loss when only a portion of the brake surface is covered by the paper sheet, various means are disclosed for limiting or preventing airflow through portions of the brake surface not covered by the paper.
    Type: Grant
    Filed: November 16, 1977
    Date of Patent: November 6, 1979
    Assignee: Siemens Aktiengesellschaft
    Inventors: Gerhard Turini, Alfred Matthies