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Flexible cube-corner retroflective sheeting
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Patent number 7,185,993
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Issue date Mar 6, 2007
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3M Innovative Properties Company
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Kenneth L. Smith
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Flexible cube-corner retroreflective sheeting
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Patent number 5,450,235
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Issue date Sep 12, 1995
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Minnesota Mining and Manufacturing Company
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Kenneth L. Smith
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Retroreflective article
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Patent number 5,117,304
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Issue date May 26, 1992
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Minnesota Mining and Manufacturing Company
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Tzu-Li J. Huang
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Retroreflective sheeting
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Patent number 4,569,857
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Issue date Feb 11, 1986
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Minnesota Mining and Manufacturing Company
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Chi F. Tung
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G02 - OPTICS
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Retroreflective sheeting
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Patent number 4,511,210
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Issue date Apr 16, 1985
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Minnesota Mining and Manufacturing Company
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Chi F. Tung
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G02 - OPTICS
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Retroflective sheeting
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Patent number 4,367,920
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Issue date Jan 11, 1983
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Minnesota Mining and Manufacturing Company
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Chi F. Tung
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G02 - OPTICS