Patents by Inventor Andreas B. Bollmann

Andreas B. Bollmann 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).

  • Dental suction apparatus
    Patent number: 4842478
    Abstract: In an aspirating unit for dental workstations the blower impeller of a vacuum pump (32), a propeller (84) and a pump impeller (68) sit on a common drive shaft (66). The drive shaft (66) is enclosed by a cyclone air extractor (34), the propeller (84) keeping foam components contained in the incoming air and fluid mixture clear of the air discharge connection of the cyclone fluid extractor (34). The pump impeller (68) conveys the fluid discharged at the bottom end of the cyclone fluid extractor (34) forcibly to the fluid outlet connection (28) of the aspirator.
    Type: Grant
    Filed: June 14, 1988
    Date of Patent: June 27, 1989
    Assignee: Durr Dental GmbH & Co
    Inventors: Walter S. Durr, Hans-Joachim Hofmann, Andreas B. Bollmann