Patents by Inventor Dennis E. Ward

Dennis E. Ward 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).

  • Filter element
    Patent number: D401306
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: November 17, 1998
    Assignee: Donaldson Company, Inc.
    Inventors: Dennis E. Ward, Kevin J. Schrage, Paul R. Coulonvaux, Johan G. Dewit, Jeffrey J. Ivarson
  • Housing for an air cleaner
    Patent number: D412567
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: August 3, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Dennis E. Ward, Kevin J. Schrage, Paul R. Coulonvaux, Johan G. Dewit, Jeffrey J. Ivarson
  • Cover for a housing for an air cleaner
    Patent number: D412568
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: August 3, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Dennis E. Ward, Kevin J. Schrage, Paul R. Coulonvaux, Johan G. Dewit, Jeffrey J. Ivarson
  • Filter element
    Patent number: D414544
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: September 28, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Dennis E. Ward, Kevin J. Schrage, Paul R. Coulonvaux, Johan G. Dewit, Jeffrey J. Ivarson
  • Safety filter element
    Patent number: D416308
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: November 9, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Dennis E. Ward, Kevin J. Schrage, Paul R. Coulonvaux, Johan G. Dewit, Jeffrey J. Ivarson