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Don Harold

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  • Prior Lake, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Reverse flow air filter arrangement and method
    • Patent number 7,455,707
    • Issue date Nov 25, 2008
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Reverse flow air filter arrangement and method
    • Patent number 6,521,009
    • Issue date Feb 18, 2003
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Reverse flow air filter arrangement
    • Patent number 6,413,289
    • Issue date Jul 2, 2002
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Reverse flow air filter arrangement
    • Patent number 6,322,602
    • Issue date Nov 27, 2001
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Reverse flow air filter arrangement
    • Patent number 6,258,145
    • Issue date Jul 10, 2001
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Inside surface of a filter element having insert construction
    • Patent number D425977
    • Issue date May 30, 2000
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Reverse flow air filter arrangement and method
    • Patent number 6,004,366
    • Issue date Dec 21, 1999
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Reverse flow air filter arrangement and method
    • Patent number 5,938,804
    • Issue date Aug 17, 1999
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Reverse flow air filter arrangement and method
    • Patent number 5,897,676
    • Issue date Apr 27, 1999
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Air cleaner assembly
    • Patent number 4,242,115
    • Issue date Dec 30, 1980
    • Donaldson Company, Inc.
    • Donald M. Harold
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

Patents Applicationslast 30 patents

  • Information Patent Application

    [REVERSE FLOW AIR FILTER ARRANGEMENT AND METHOD]
    • Publication number 20040148913
    • Publication date Aug 5, 2004
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Application

    Reverse flow air filter arrangement and method
    • Publication number 20040006955
    • Publication date Jan 15, 2004
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Application

    Reverse flow air filter arrangement and method
    • Publication number 20020092282
    • Publication date Jul 18, 2002
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Application

    Reverse flow air filter arrangement and method
    • Publication number 20020014058
    • Publication date Feb 7, 2002
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Application

    Reverse flow air filter arrangement
    • Publication number 20010020419
    • Publication date Sep 13, 2001
    • Donaldson Company, Inc.
    • Donald Francis Engel
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL