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:
Jun. 28, 1994
Filed:
Jun. 11, 1993
Mark E Martich, Hanover, MA (US);
Pacific Scientific Company, Weymouth, MA (US);
Abstract
An outdoor lighting control circuit for operation with a variable input voltage and with an electrical lamp, the circuit including a first resistive impedance element for protecting the circuit from excessive current, and a photosensitive element for presenting a first impedance when actuated by light and a different second impedance in the absence of light. The photosensitive element is electrically in series with the first resistive impedance element, to form a first series combination. An electrical relay in the circuit has contacts for selectively connecting the load to the input voltage and has a relay coil. A second resistive impedance element of the circuit controls the current in the relay coil. The second resistive impedance element is electrically in parallel with the relay coil, to form a first parallel combination. The first parallel combination is electrically in series with the first series combination, all elements being between the input terminals that receive the operating voltage.