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Projection device
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Patent number 9,268,077
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Issue date Feb 23, 2016
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Delta Electronics, Inc.
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June-Jei Huang
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Image display device
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Patent number 8,829,472
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Issue date Sep 9, 2014
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NEC Corporation
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Masahiko Ohta
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3721756
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Patent number 3,721,756
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Issue date Mar 20, 1973
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3510571
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Patent number 3,510,571
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Issue date May 5, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3507984
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Patent number 3,507,984
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Issue date Apr 21, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2943315
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Patent number 2,943,315
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Issue date Jun 28, 1960
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G01 - MEASURING TESTING
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2807799
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Patent number 2,807,799
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Issue date Sep 24, 1957
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2513520
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Patent number 2,513,520
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Issue date Jul 4, 1950
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H04 - ELECTRIC COMMUNICATION TECHNIQUE