Patents by Inventor Robert C. Aigner

Robert C. Aigner 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).

  • Unattended air cleaning system for surface maintenance machine
    Patent number: 5013333
    Abstract: A powered surface maintenance machine having an exhaust air system for dust control is equipped with air filters for removing dust from the air before exhausting it to atmosphere. Automatic means are provided to mechanically shake dust from the filters whenever enough has accumulated on them to adversely affect dust control. This filter cleaning is accomplished with no attention from the machine operator and does not interrupt the operation of the machine or the air flow needed for dust control.
    Type: Grant
    Filed: April 13, 1990
    Date of Patent: May 7, 1991
    Assignee: Tennant Company
    Inventors: Jeffrey J. Beaufoy, Robert C. Aigner, Steven A. Burke