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Organic electroluminescent device
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Patent number 6,489,489
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Issue date Dec 3, 2002
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Idemitsu Kosan Co., Ltd.
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Toshio Sakai
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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3505361
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Patent number 3,505,361
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Issue date Apr 7, 1970
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C07 - ORGANIC CHEMISTRY
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3389188
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Patent number 3,389,188
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Issue date Jun 18, 1968
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C07 - ORGANIC CHEMISTRY
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3336407
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Patent number 3,336,407
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Issue date Aug 15, 1967
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C07 - ORGANIC CHEMISTRY
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2198374
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Patent number 2,198,374
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Issue date Apr 23, 1940
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C07 - ORGANIC CHEMISTRY
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1821035
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Patent number 1,821,035
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Issue date Sep 1, 1931
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C07 - ORGANIC CHEMISTRY