Patents by Inventor Don Harold, deceased

Don Harold, deceased 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).

  • Reverse flow air filter arrangement and method
    Patent number: 6004366
    Abstract: A reverse flow air filter arrangement is provided. The arrangement includes a filter element having first and second end caps, the second end cap having a central drainage aperture. A funnel shape on an interior surface of second end cap is used to direct moisture flow to the drainage aperture. The arrangement includes a housing in which the filter element is positioned, operatively, during use. Certain features in the housing facilitate moisture withdrawal from the filter element while also inhibiting interference with sealing between the filter element and the housing.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: December 21, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, deceased
  • Reverse flow air filter arrangement and method
    Patent number: 5938804
    Abstract: A reverse flow air filter arrangement is provided. The arrangement includes a filter element having first and second end caps, the second end cap having a central drainage aperture. A funnel shape on an interior surface of second end cap is used to direct moisture flow to the drainage aperture. The arrangement includes a housing in which the filter element is positioned, operatively, during use. Certain features in the housing facilitate moisture withdrawal from the filter element while also inhibiting interference with sealing between the filter element and the housing.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: August 17, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, deceased, by Shirley A. Harold, legal representative
  • Reverse flow air filter arrangement and method
    Patent number: 5897676
    Abstract: A reverse flow air filter arrangement is provided. The arrangement includes a filter element having first and second end caps, the second end cap having a central drainage aperture. A funnel shape on an interior surface of second end cap is used to direct moisture flow to the drainage aperture. The arrangement includes a housing in which the filter element is positioned, operatively, during use. Certain features in the housing facilitate moisture withdrawal from the filter element while also inhibiting interference with sealing between the filter element and the housing.
    Type: Grant
    Filed: June 5, 1998
    Date of Patent: April 27, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, deceased
  • Inside surface of a filter element having insert construction
    Patent number: D425977
    Type: Grant
    Filed: March 24, 1998
    Date of Patent: May 30, 2000
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, deceased