Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 17, 2007
Patent Application Number
10760069
Date Filed
January 16, 2004
Patent Citations Received
Patent Primary Examiner
Patent abstract
A barrier movement operator which uses an A.C. motor to move a barrier is disclosed herein. The operator senses a characteristic of barrier movement, such as motor rotation speed, to detect when the barrier contacts an obstruction. The motor and/or the circuitry for applying electrical power to the motor have been enhanced to improve the detectibility of contact with an obstruction.
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