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:
Jan. 01, 1985
Filed:
Mar. 05, 1982
George R Utting, Satellite Beach, FL (US);
Victoreen Incorporated, Cleveland, OH (US);
Abstract
A dual-color photographic sensitometer for exposing a piece of test film to a known amount of light of a selectable one of two different colors. The multiple-step density gradient of the sensitometer is uniformly illuminated along its entire length by an electroluminescent lamp comprising a plurality of phosphor segments of varying widths which are electrically connected to form two sets, with each of the segments in each set adapted upon excitation to emit a single color light. The width of each segment of a set is determined in accordance with its distance from the multiple-step density gradient so that the multiple-step density gradient is illuminated substantially uniformly by each segment set.