Patents by Inventor John C. Bertelsen

John C. Bertelsen 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).

  • Filtering system for paper handling machines
    Patent number: 4678489
    Abstract: A filter apparatus is disclosed for removing contaminants directly from paper handling machines in data processing rooms. Such contaminants include paper dust and carbon black from high speed paper handling machines such as computer printers, paper cutters and the like. The apparatus comprises a wheeled housing having a top cover with an outlet grille. A squirrel cage fan is suspended from the cover beneath the grille. A filter pack is mounted beneath the fan. The bottom of the housing has an inlet opening connected to a duct which passes air from the machine being serviced, through the filter pack and out the grille.A vacuum motor is mounted in the bottom of the housing and connected to a flexible hose for picking up material on the floor as well as spillage from inside the data processing machines. This material is passed through an in-line filter. The air from both the duct and the flexible hose is passed through the filter pack.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: July 7, 1987
    Assignee: John C. Bertelsen
    Inventor: John C. Bertelsen
  • Filter apparatus for high speed printers
    Patent number: 4563943
    Abstract: A filter system for removing air borne contaminants such as carbon black discharged from high speed printers such as page printers, laser printers, and the like.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: January 14, 1986
    Inventor: John C. Bertelsen