Patents by Inventor Donald Francis Engel

Donald Francis Engel 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: 7455707
    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: February 10, 2003
    Date of Patent: November 25, 2008
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Shirley A. Harold, Don Harold
  • [REVERSE FLOW AIR FILTER ARRANGEMENT AND METHOD]
    Publication number: 20040148913
    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: Application
    Filed: February 10, 2003
    Publication date: August 5, 2004
    Applicant: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold
  • Reverse flow air filter arrangement and method
    Publication number: 20040006955
    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: Application
    Filed: February 10, 2003
    Publication date: January 15, 2004
    Applicant: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, Shirley A. Harold
  • Reverse flow air filter arrangement and method
    Patent number: 6521009
    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: October 9, 2001
    Date of Patent: February 18, 2003
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold
  • Reverse flow air filter arrangement and method
    Publication number: 20020092282
    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: Application
    Filed: October 9, 2001
    Publication date: July 18, 2002
    Applicant: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, Shirley A. Harold
  • Reverse flow air filter arrangement
    Patent number: 6413289
    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 a filter element and the housing.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: July 2, 2002
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold
  • Reverse flow air filter arrangement and method
    Publication number: 20020014058
    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 a filter element and the housing.
    Type: Application
    Filed: October 9, 2001
    Publication date: February 7, 2002
    Applicant: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold, Shirley A. Harold
  • Reverse flow air filter arrangement
    Patent number: 6322602
    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: May 3, 2001
    Date of Patent: November 27, 2001
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold
  • Reverse flow air filter arrangement
    Publication number: 20010020419
    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: Application
    Filed: May 3, 2001
    Publication date: September 13, 2001
    Applicant: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold
  • Reverse flow air filter arrangement
    Patent number: 6258145
    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: December 20, 1999
    Date of Patent: July 10, 2001
    Assignee: Donaldson Company, Inc.
    Inventors: Donald Francis Engel, Dolan Bartels, John Hacker, Bruce Crenshaw, Don Harold
  • 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
  • Reverse flow air filter arrangement and method
    Patent number: 5690712
    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: October 31, 1996
    Date of Patent: November 25, 1997
    Assignee: Donaldson Company, Inc.
    Inventor: Donald Francis Engel
  • 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