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Todd R Williams, Daniel J Kingston: Prevention of groove tip deformation in brightness enhancement film. Minnesota Mining and Manufacturing company, Gary L Griswold, Walter N Kirn, Robert H Jordan, May 6, 1997: US05626800 (173 worldwide citation)

A method of producing a microstructure bearing article that includes the steps of molding the microstructure on the base, curing the resin that forms the microstructure, and heat treating the microstructure. The heat treating is performed at a temperature that is at least equal to a normal glass tra ...


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John C Nelson, Sanford Cobb Jr: High efficiency retroreflective material. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Robert H Jordan, January 23, 1990: US04895428 (143 worldwide citation)

The present invention provides a retroreflective material which has improved retroreflectivity at high angles of incidence. The retroreflective material comprises a transparent surface layer and an array of reflecting elements, each of the reflecting elements including a rectangular base having a le ...


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John C Nelson, Mark E Gardiner, Roger H Appeldorn, Timothy L Hoopman: High efficiency cube corner retroflective material. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Robert H Jordan, July 3, 1990: US04938563 (137 worldwide citation)

The present invention provides a retroreflective material which is efficient at high angles of incidence and which may be individually tailored so as to distribute light retroreflected by the material into a desired pattern or divergence profile. The retroreflective material of the present invention ...


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Roger R Kult, Terry R Bailey, Howard R Tolliver: Cellular encapsulated-lens high whiteness retroreflective sheeting with flexible cover sheet. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Robert H Jordan, November 19, 1991: US05066098 (110 worldwide citation)

Cellular, encapsulated-lens retroreflective sheeting comprising: (1) a base sheet of a monolayer of retroreflective elements partially embedded in a binder layer which typically is white or comprises a whitening agent; (2) a cover sheet disposed in spaced relation from the layer of retroreflective e ...


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Shih Lai Lu: Plano-convex base sheet for retroreflective articles and method for making same. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Robert H Jordan, October 19, 1993: US05254390 (109 worldwide citation)

An article comprising a transparent plano-convex base sheet having first and second broad faces, the second face being substantially planar and the first face having an array of substantially hemi-spheroidal microlenses thereon, the shape of the microlenses and thickness of the base sheet being such ...


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Lynn E Faykish, Douglas K Fossum, Wallace K Bingham: Retroreflective security laminates with dual level verification. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Robert H Jordan, December 8, 1992: US05169707 (101 worldwide citation)

A retroreflective security laminate, designed to be applied to the surface of a document over information thereon, providing dual levels of verification. The laminates have primary legends which are viewable under both ordinary diffuse lighting conditions and retroreflective viewing conditions and m ...


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Terry L Morris, Herbert J Fox, Thomas P Hanschen, Philip Miller: Laser machined replication tooling. Minnesota Mining and Manufacturing Company, Robert H Jordan, August 11, 1998: US05792411 (99 worldwide citation)

The invention relates to a method of manufacturing a replication master tooling article suitable for manufacturing replicated articles by machining a substrate surface with laser energy to produce a plurality of geometric structures in the substrate, the geometric structures having side surfaces ext ...


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Wallace K Bingham: Retroreflective sheet with enhanced brightness. Minnesota Mining and Manufacturing Company, Donald M Sell, James A Smith, Robert H Jordan, August 16, 1988: US04763985 (97 worldwide citation)

Retroreflective construction comprising a monolayer of microspheres with associated dielectric mirrors which are hemispherically surrounded by tangentially-oriented, preferably contour-conforming, reflective pigment nacreous flakes. The dielectric mirrors and reflective nacreous pigment flakes coope ...


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Susan K Nestegard, Gerald M Benson, Cheryl Frey, John C Kelliher, James E Lasch, Kenneth L Smith, Theodore J Szczech: Dual orientation retroreflective sheeting. Minnesota Mining and Manufacturing Company, Jed W Caven, Robert H Jordan, Stephen C Jensen, January 6, 1998: US05706132 (80 worldwide citation)

A cube corner retroreflective sheeting construction comprising alternating zones of cube corner element arrays disposed at approximately ninety degrees orientations to provide exactly two principal plane of improved retroreflective performance in response to light incident on the sheeting at high en ...