1
Stephen P McGrew: Anticounterfeiting method and device utilizing holograms and pseudorandom dot patterns. Wells St John Roberts Gregory & Matkin, March 7, 1995: US05396559 (179 worldwide citation)

A security device for use on identification cards, monetary documents, and the like using a reference pattern and a message pattern each having the appearance of a random pattern of dots. The reference pattern is a dense pattern of randomly positioned dots, and the message pattern is a modulated ver ...


2
Stephen P McGrew: Quantum dot security device and method. Dorsey & Whitney, February 17, 2004: US06692031 (124 worldwide citation)

Quantum dots are used as fluorescent taggants in security inks, papers, plastics, explosives, or any other item or substance in which it is desired to provide a distinct signature or marking. Quantum dots of specific sizes, compositions and structures may be used to produce specific fluorescence, mi ...


3
Stephen P McGrew: System for synthesizing strip-multiplexed holograms. Seed Berry Vernon & Baynham, June 10, 1980: US04206965 (101 worldwide citation)

A system for synthesizing strip-multiplexed holograms, with or without coherent light, from a plurality of two-dimensional images. The two-dimensional images may be formed by a motion picture film of a rotating subject such that each image is a view of the subject from a different angle. The images ...


4
Stephen P McGrew: Method of fabricating surface relief holograms. Seed and Berry, July 19, 1988: US04758296 (98 worldwide citation)

A method of manufacturing surface relief holograms wherein an original surface relief hologram in the form of an endless loop or a drum is continuously coated with a radiation-curable resin. After curing, the resin bears a replica of the original hologram and it is continuously drawn off from the or ...


5
Stephen P McGrew: Full-color hologram. Seed and Berry, December 20, 1983: US04421380 (87 worldwide citation)

A new class of holograms, having the properties of full-color reconstruction from a single white light source, an extended vertical viewing aperture, and extended scene depth is disclosed. These advantageous properties are provided by a hologram composed of three intermeshed holograms, each of which ...


6
Stephen P McGrew: Anticounterfeiting method and device. Seed and Berry, May 20, 1986: US04589686 (76 worldwide citation)

A method of making a security device and the device are disclosed, wherein an embossable material is applied to a substrate in multiply connected regions. (A multiply connected region is one that has more than one continuous boundary). The regions have sufficient density of coverage to cause the emb ...


7
Stephen P McGrew: Diffractive color and texture effects for the graphic arts. Seed and Berry, January 5, 1988: US04717221 (63 worldwide citation)

A method of producing color and texture effects on a surface (210,400) without the use of pigments or actual texturing. Diffraction patterns, generated by interference between two light beams (220,230), are recorded in a suitable high-resolution photographic material (210,400) and are used instead o ...


8
Stephen P McGrew: Solar power system. Seed Berry Vernon & Baynham, May 27, 1980: US04204881 (62 worldwide citation)

A system for generating electrical power from sunlight, comprising a focussing diffraction grating or other focussing, spectrally dispersive means and a photocell array. The diffraction grating focuses sunlight into a spectrally dispersed band. The photocell array is composed of cells with different ...


9
Stephen P McGrew: Holocomposer. Seed and Berry, August 11, 1992: US05138471 (50 worldwide citation)

A method is disclosed for making holographic images by recording an array of pixels which together form a two or three dimensional composite image. Each pixel corresponds to a sampling of just those rays which would pass through a given point on the surface of an ordinary hologram. Every common type ...


10
Stephen P McGrew: Surface relief holograms and holographic hot-stamping foils, and method of fabricating same. Seed and Berry, March 6, 1990: US04906315 (45 worldwide citation)

A method of manufacturing surface relief holograms wherein an original surface relief hologram in the form of an endless loop or a drum is continuously coated with a radiation-curable resin. After curing, the resin bears a replica of the original hologram and it is continuously drawn off from the or ...