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Piston ring
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Patent number 10,100,929
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Issue date Oct 16, 2018
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Kabushiki Kaisha Riken
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Keiji Honda
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Sliding member and piston ring
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Patent number 10,036,472
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Issue date Jul 31, 2018
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KABUSHIKI KAISHA RIKEN
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Masaki Moronuki
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Combination of cylinder and piston ring
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Patent number 9,644,738
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Issue date May 9, 2017
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Kabushiki Kaisha Riken
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Akira Kunimoto
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Piston ring
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Patent number 9,371,797
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Issue date Jun 21, 2016
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Kabushiki Kaisha Riken
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Takuma Sekiya
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Piston ring
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Patent number 9,347,559
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Issue date May 24, 2016
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Kabushiki Kaisha Riken
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Takuma Sekiya
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Sliding member
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Patent number 8,123,227
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Issue date Feb 28, 2012
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Kabushiki Kaisha Riken
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Minoru Kawanishi
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Hard amorphous carbon film
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Patent number 7,955,691
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Issue date Jun 7, 2011
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Kabushiki Kaisha Riken
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Masaki Moronuki
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Valve lifter
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Patent number 7,156,061
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Issue date Jan 2, 2007
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Kabushiki Kaisha Riken
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Takashi Matsui
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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