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Integrated front projection system
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Patent number 6,394,609
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Issue date May 28, 2002
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3M Innovative Properties Company
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Ernesto M. Rodriguez
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Integrated front projection system
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Patent number 6,179,426
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Issue date Jan 30, 2001
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3M Innovative Properties Company
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Ernesto M. Rodriguez
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Catadioptric Fresnel lens
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Patent number 5,446,594
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Issue date Aug 29, 1995
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Minnesota Mining and Manufacturing Company
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John C. Nelson
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Illumination system for overhead projector
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Patent number 4,719,547
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Issue date Jan 12, 1988
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Minnesota Mining and Manufacturing Company
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Dennis F. Vanderwerf
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Rear-projection lectern
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Patent number D288571
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Issue date Mar 3, 1987
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Minnesota Mining and Manufacturing Company
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Dennis F. VanderWerf
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D16 - Photography and optical equipment
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Dual-magnification rear projection lectern
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Patent number 4,561,740
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Issue date Dec 31, 1985
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Minnesota Mining and Manufacturing Company
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Dennis F. Vanderwerf
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Directional front projection screen
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Patent number 4,206,969
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Issue date Jun 10, 1980
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Minnesota Mining and Manufacturing Company
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Sanford Cobb
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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