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:
Mar. 06, 1984
Filed:
Jun. 22, 1981
George W Plumly, Fort Worth, TX (US);
Other;
Abstract
A lighted exit sign comprising a light transmitting plate having a viewing side and upper and lower edges onto which light can be projected for transmission into the plate for viewing from the viewing side. Upper and lower printed circuit boards are supported close to the upper and lower edges of the plate. A plurality of small incandescent light bulbs are secured to the upper and lower circuit boards for producing light when energized for projection onto the upper and lower edges for transmission into the plate for viewing from the viewing side. A white, light reflecting layer is formed on the side of the plate opposite the viewing side. The letters EXIT are formed on the viewing side in two layers. The first layer is white in color and is secured directly to the viewing side. The second layer is preferably red in color and is secured to the first layer. A transformer is employed for converting an A C voltage to a level below the rated voltage of the bulbs and to a level above the rated voltage of the bulbs. The A C voltage below the rated voltage of the bulbs is employed for normally energizing said bulbs. The A C voltage above the rated voltage of the bulbs is rectified and applied to maintain batteries charged. In the event that the A C power fails, a switching system connects the batteries to the bulbs to energize them with a voltage greater than their rated voltage.