1
David L Wortman, Sanford Cobb Jr, Mark E Gardiner: Light directing film having variable height structured surface and light directing article constructed therefrom. Minnesota Mining and Manufacturing Company, Jed W Caven, Stephen W Buckingham, Stephen C Jensen, June 23, 1998: US05771328 (257 worldwide citation)

A light directing film including a first surface and a second structured surface. The structured surface includes a repeating pattern of prism zones including at least a first zone having a plurality of prism elements with peaks disposed at a first distance from a reference plane and a second zone h ...


2
Mark B O Neill, Sanford Cobb Jr: Brightness enhancement film with soft cutoff. 3M Innovative Properties Company, Stephen W Buckingham, June 29, 1999: US05917664 (235 worldwide citation)

A brightness enhancement film has a plurality of linear prisms. The prisms are disposed in pairs, each pair having first and second prisms and each prism has a prism angle and a valley angle. Either the prism angles or the valley angles, but not both, are equal.


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Sanford Cobb Jr, Mark E Gardiner, Keith M Kotchick, Kazuhiko Toyooka, William A Hibbard: Variable pitch structured optical film. 3M Innovative Properties Company, Stephen W Buckingham, July 6, 1999: US05919551 (172 worldwide citation)

The present invention includes a structured optical film with variable pitch peaks and/or grooves to reduce the visibility of moire interference patterns and optical displays incorporating one or more layers of the film. The pitch variations can be over groups of adjacent peaks and/or valleys or bet ...


5
Sanford Cobb Jr: Totally internally reflecting thin, flexible film. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Stephen W Buckingham, March 6, 1990: US04906070 (167 worldwide citation)

A thin, flexible film made of a transparent polymeric material including a structured surface and an opposite smooth surface, wherein light striking either surface, within certain angular ranges, is totally internally reflected. The structured surface includes a linear array of miniature substantial ...


6
Sanford Cobb Jr: Totally internally reflecting thin, flexible film. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Stephen W Buckingham, October 15, 1991: US05056892 (151 worldwide citation)

A thin, flexible film made of a transparent polymeric material including a structured surface and an opposite smooth surface, wherein light striking either surface, within certain angular ranges, is totally internally reflected. The structured surface includes a linear array of miniature substantial ...


7
Andrew J Ouderkirk, Sanford Cobb Jr, Brian D Cull, Michael F Weber, David L Wortman: Transflective displays with reflective polarizing transflector. 3M Innovative Properties Company, Robert J Pechman, July 17, 2001: US06262842 (146 worldwide citation)

A transflector is described which increases efficiency and brightness under both ambient and supplemental lighting conditions in visual display applications. In one embodiment, the transflector includes a reflective polarizing element that reflects one polarization of light and transmits the other. ...


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Bettie C Fong, Wade D Kretman, Keith M Kotchick, Sanford Cobb Jr, Richard A Miller, Todd R Williams, Kazuhiko Toyooka: Brightness enhancement article. 3M Innovative Properties Company, Stephen W Buckingham, August 28, 2001: US06280063 (144 worldwide citation)

A brightness enhancement article that includes: (a) a transparent, flexible substrate; (b) a first major surface having an array of prisms with blunted or rounded peaks characterized by a chord width, cross-sectional pitch width, and radius of curvature in which the chord width is equal to about 20- ...


9
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 ...


10
Sanford Cobb Jr, Brian D Cull, Andrew J Ouderkirk, Michael F Weber, David L Wortman: Diffusely reflecting multilayer polarizers and mirrors. Minnesota Mining and Manufacturing Company, John A Fortkort, October 20, 1998: US05825542 (139 worldwide citation)

Highly efficient diffusely reflecting multilayer mirrors diffusely reflect light incident upon them. Highly efficient diffusely reflecting multilayer polarizers diffusely reflect light of one polarization while diffusely transmitting the other polarization. The diffusely reflecting mirror includes a ...