Patents by Inventor Dennis A. Nordberg

Dennis A. Nordberg 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).

  • Air cleaner apparatus
    Patent number: 4746340
    Abstract: An air cleaner including a plurality of regularly arranged vortex separators and a network of regularly arranged exhaust ducts is disclosed. The vortex separators include a restriction between vortex air and particulate laden scavengable air. The duct network includes a plurality of regularly arranged structural ducts extending between the spaced apart side plates which hold the vortex separators. The structural ducts are in fluid communication with the ducting network leading to a common output.
    Type: Grant
    Filed: October 28, 1986
    Date of Patent: May 24, 1988
    Assignee: Donaldson Company, Inc.
    Inventors: Reynold F. Durre, Dennis A. Nordberg