Resources Contact Us Home Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE     Revolving Door Control, Inc. Patents Assignee: Revolving Door Control, Inc. Address: Claremont, CA No. of patents: 1 Patents: Patent Number Title Of Patent Date Issued 5012455 Security door with improved sensor for detecting unauthorized passage April 30, 1991 A control system for a revolving door includes an ultrasonic sensor having multiple sensor heads. The door has a housing, and multiple moveable compartments formed by door wings attached to and radially extending from a rotatable axis. The sensors emit energy waves into the housing in       Recently Added Patents Vehicle motion control apparatus Honeycomb filter Distortion compensator, optical receiver, distortion compensator and optical receiver controlling methods, and optical transmission system Apparatus for determining an air-fuel ratio imbalance among cylinders of an internal combustion engine Query generation Filter device for reducing automobile exhaust fume Optical scanning apparatus and image forming apparatus   Randomly Featured Patents Shoe rack Securing apparatus for expansion cards Method of and apparatus for evaluation and mitigation of microsleep events Gaze-actuated information system Spout Apparatus for fabrication of concrete brick Method and device for the separation of dust particles Analyzing exhaust gases from an internal combustion engine Integrated circuit having processor coupled by common bus to programmable read only memory for processor operation and processor uncoupled from common bus when programming read only memory fro Combination of a chamber and a piston, a pump, a motor, a shock absorber and a transducer incorporating the combination © 2006-2011. PatentGenius.com All Rights Reserved.