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Embossed washer
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Patent number 6,824,225
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Issue date Nov 30, 2004
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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Cutting tool retainer
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Patent number 6,428,110
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Issue date Aug 6, 2002
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Kennametal Inc.
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Cary D. Ritchey
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Cutting tool retainer
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Patent number 6,070,945
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Issue date Jun 6, 2000
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Kennametal Inc.
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Cary D. Ritchey
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Digging tooth
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Patent number 5,143,163
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Issue date Sep 1, 1992
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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Cemented carbide tip
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Patent number 5,141,289
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Issue date Aug 25, 1992
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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Digging tooth
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Patent number 5,067,262
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Issue date Nov 26, 1991
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Kennametal Inc.
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Stephen P. Stiffler
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Cemented carbide tip
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Patent number 4,941,711
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Issue date Jul 17, 1990
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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Earth engaging cutter bit
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Patent number 4,940,288
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Issue date Jul 10, 1990
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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Cutter bit and tip
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Patent number 4,911,504
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Issue date Mar 27, 1990
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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Earth engaging cutter bit
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Patent number 4,911,503
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Issue date Mar 27, 1990
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Kennametal Inc.
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Stephen P. Stiffler
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E21 - EARTH DRILLING MINING
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