Patents by Inventor John D. Sandkamp

John D. Sandkamp 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).

  • Joint and seal system for air transfer tubes
    Patent number: 5474337
    Abstract: Assembly is described for providing a radial seal between two air conduit members. The assembly generally comprises a first conduit member having seal retainer thereon and, second conduit member having a tubular section which is inserted into the seal retainer, during formation of the radial seal. The seal retainer comprises a retainer trough having a removable and replaceable seal ring positioned therein.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: December 12, 1995
    Assignee: Donaldson Company, Inc.
    Inventors: Larry R. Nepsund, John D. Sandkamp
  • Advanced disposable air cleaner
    Patent number: 5112372
    Abstract: An air cleaner with an integrated nozzle element comprised of a perforated portion at one end, a generally centrally located throat and a noise suppressing portion from the second end to the throat. The nozzle element is located within the inner opening of the air cleaner's tubular filter element. The perforated portion is arranged and configured to be the same size and shape as the inner opening to provide support for the tubular filter element, the throat is arranged and configured to provide the required restriction to create a specified negative engine crankcase pressure, and the noise suppressing portion is arranged and configured to provide the required attenuation of engine intake noise passing through the air cleaner.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: May 12, 1992
    Assignee: Donaldson Company, Inc.
    Inventors: Thomas A. Boeckermann, Larry R. Nepsund, John D. Sandkamp