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Ink set and ink-jet recording method
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Patent number 10,072,170
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Issue date Sep 11, 2018
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Ricoh Company, Ltd.
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Hikaru Kobayashi
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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Fluid purifying apparatus
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Patent number 9,260,330
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Issue date Feb 16, 2016
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Ricoh Company, Ltd.
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Kenichi Hayakawa
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE