TREA

James K. Elfstrand

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  • Mounds View, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Air cleaner; method and use
    • Patent number 6,340,375
    • Issue date Jan 22, 2002
    • Donaldson Company, Inc.
    • Rocco A. DePietro
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Air cleaner; method and use
    • Patent number 6,059,851
    • Issue date May 9, 2000
    • Donaldson Company, Inc.
    • Rocco A. DePietro
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Method of servicing an air cleaner and of filtering engine intake a...
    • Patent number 6,015,452
    • Issue date Jan 18, 2000
    • Donaldson Company, Inc.
    • Larry R. Nepsund
    • F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • Information Patent Grant

    Air cleaner
    • Patent number D418592
    • Issue date Jan 4, 2000
    • Donaldson Company, Inc.
    • Rocco A. DePietro
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Filter element having circular sleeve
    • Patent number D407808
    • Issue date Apr 6, 1999
    • Donaldson Company, Inc.
    • Larry R. Nepsund
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Filter sleeve
    • Patent number D404807
    • Issue date Jan 26, 1999
    • Donaldson Company, Inc.
    • Larry R. Nepsund
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Filter arrangement including removable filter with first and second...
    • Patent number 5,858,044
    • Issue date Jan 12, 1999
    • Donaldson Company, Inc.
    • Larry R. Nepsund
    • F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • Information Patent Grant

    Panel filter construction
    • Patent number D402361
    • Issue date Dec 8, 1998
    • Donaldson Company, Inc.
    • Larry R. Nepsund
    • D23 - Environmental heating and cooling