The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2001
Filed:
Sep. 03, 1999
John J. Breslin, late of Los Altos, CA (US);
James J. McCarthy, Belmont, CA (US);
Beamco, Inc., Mountain View, CA (US);
Abstract
A control circuit for selectively energizing at least one electrical device coupled to the control circuit via a pair of conductive wires with an operating voltage. The control circuit comprises a control circuit for selectively supplying and withholding operating electrical power to at least one electrical device. A first current detector is connected to a control voltage and senses a current flow resulting from closure of a circuit connected to a control voltage in at least one wire of the pair of conductive wires. A second current detector is connected to the operating voltage and senses a current flow resulting from closure of a circuit connected to the operating voltage in at least one wire of the pair of conductive wires. A first switching device responds to the first current detector to disconnect the control voltage from at least one of the wires and to connect the operating voltage to the conductive pair. A second switching device responds to the second current detector to maintain operating voltage to the conductor pair. The second switching device responds to the second current detector to connect operating power to the electrical device.