1
John M Evans Jr, Steven J King, Carl F R Weiman: Mobile robot navigation employing retroreflective ceiling features. Transitions Research Corporation, Perman & Green, September 24, 1991: US05051906 (261 worldwide citation)

Apparatus and method which provides for the determination of a vehicle's orientation and position in an environment, such as a hallway, from an image of a retroreflective ceiling feature. A mobile robot 10 includes a light source 28 and a camera 12 that are pitched up obliquely at an intermediate an ...


2
Carl F R Weiman, John M Evans Jr: Digital image compression employing a resolution gradient. Transitions Research Corporation, Perman & Green, April 7, 1992: US05103306 (243 worldwide citation)

Video image compression apparatus and method provides full color, wide field of view, real time imagery having high central resolution. Compression ratios of 1600:1 are achieved thus reducing a required data transmission bandwidth sufficiently to abolish line-of-sight restrictions. Data compression ...


3
John M Evans Jr, Carl F R Weiman, Steven J King: Visual navigation and obstacle avoidance structured light system. Transitions Research Corporation, Perman & Green, August 13, 1991: US05040116 (227 worldwide citation)

A vision system for a vehicle, such as a mobile robot (10) includes at least one radiation projector (14, 16) which projects a structured beam of radiation into the robot's environment. The structured beam of radiation (14a, 16a) preferably has a substantially planar pattern of sufficient width to e ...


4
William Pong Jr, Joseph F Engelberger, John M Evans Jr, William S Kazman: Autonomous vehicle for working on a surface and method of controlling same. Transitions Research Corporation, Kramer Brufsky & Cifelli, October 9, 1990: US04962453 (195 worldwide citation)

A means and method for control of an autonomous vehicle while working on a surface, specifically for operation of an automatic floor cleaning machine using power derived from line power through a wall plug and cord. The vehicle uses information derived from contact between bumpers and objects in the ...


5
John M Evans Jr, Carl F R Weiman, Steven J King: Visual navigation and obstacle avoidance structured light system. Transitions Research Corporation, Perman & Green, September 4, 1990: US04954962 (191 worldwide citation)

A vision system for a vehicle, such as a mobile robot (10) includes at least one radiation projector (14, 16) which projects a structured beam of radiation into the robot's environment. The structured beam of radiation (14a, 16a) preferably has a substantially planar pattern of sufficient width to e ...


6
John M Evans Jr, Carl F R Weiman, Steven J King: Mobile robot navigation employing ceiling light fixtures. Transitions Research Corporation, Perman & Green, June 12, 1990: US04933864 (184 worldwide citation)

Apparatus and method which provides for the determination of a vehicle's orientation and position in an environment, such as a hallway, from an image of ceiling lights. A mobile robot 10 includes a camera 12 that is pitched up obliquely at an intermediate angle between a horizon and a zenith. The ca ...


7
Joseph W Wittmann, John M Evans: Cured cellulose ester, method of curing same, and use thereof. UCO Optics, Pollock Vande Sande & Priddy, June 12, 1984: US04454295 (154 worldwide citation)

Cellulose esters are cured by exposure to radiation preferably followed by exposure to elevated temperatures of at least about 100.degree. C. In addition, polymers obtained from reacting certain cellulose esters with certain polymerizable silicon esters are provided. The cured cellulose esters are s ...


8
John M Evans, Colin C Wise: Method and apparatus for measuring blood oxygen levels. Cushman Darby & Cushman, October 6, 1987: US04697593 (133 worldwide citation)

Apparatus for the in-vivo measurement of blood oxygen levels in a patient, including


9
Carl F R Weiman, John M Evans Jr: One dimensional image visual system for a moving vehicle. Transitions Research Corporation, Perman & Green, February 27, 1990: US04905151 (131 worldwide citation)

A vision system for a mobile robot 10 comprises an optical sensor subsystem 20 which generates a substantially one dimensional image of an environment, a signal processing subsystem 24 for extracting and enhancing significant vertical visual features from the one dimensional image and a feature proc ...


10
Jerome A Legerton, Chun Shen Lee, John M Evans, Praful C Doshi: Variable transmissivity annular mask lens for the treatment of optical aberrations. PBH, Burns Doane Swecker & Mathis L, September 2, 1997: US05662706 (126 worldwide citation)

An annular mask lens for the treatment of optical aberrations such as but not limited to night myopia, spherical aberration, aniridia, keratoconus, corneal scarring, penetrating keratoplasty, and post refractive surgery complication. The lens has an annular mask having an aperture larger than conven ...