Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 7, 2007
Patent Application Number
10741143
Date Filed
December 19, 2003
Patent Citations Received
Patent Primary Examiner
Patent abstract
A door obstacle sensor in which an optical transmitter and a receiver are located on the same side of an entranceway, and a retroreflector is placed on the opposite side. A controller measures the time of flight of a light beam that is reflected from the retroreflective target. All future target distances are compared to the initial distance, and a decision is made as to an object being present in or absent from the entranceway.
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