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Electrophoretic display
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Patent number 5,872,552
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Issue date Feb 16, 1999
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International Business Machines Corporation
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Joseph Grover Gordon
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G02 - OPTICS
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Electrophoretic display
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Patent number 5,745,094
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Issue date Apr 28, 1998
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International Business Machines Corporation
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Joseph Grover Gordon
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G02 - OPTICS
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Apparatus for printing grey scale images
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Patent number 5,184,183
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Issue date Feb 2, 1993
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International Business Machines, Corporation
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John P. Karidis
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Printing grey scale images
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Patent number 5,142,337
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Issue date Aug 25, 1992
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International Business Machines, Corp.
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John P. Karidis
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY