Electricity: motive power systems – Automatic and/or with time-delay means – Electrical conditions in circuit other than controlled motor...
Reexamination Certificate
2008-09-02
2008-09-02
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Electrical conditions in circuit other than controlled motor...
C318S450000, C318S466000, C318S467000
Reexamination Certificate
active
10958181
ABSTRACT:
A system and method for sensing capacitance at the edge of a movable barrier and for detecting an obstruction includes positioning a conductive member within or about a holder. A sensed capacitance between the conductive member and ground. A controller is coupled to the sensor. The controller determines whether an obstruction exists within a path of the barrier by analyzing the sensed capacitance. The conductive member and holder move away from a physical reference as the physical reference is approached such that the sensed capacitance between the conductive member and the physical reference remains below a predetermined threshold.
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Donovan Lincoln
Fitch Even Tabin & Flannery
Glass Erick
The Chamberlain Group, Inc.
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