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:
Apr. 06, 1993
Filed:
Feb. 22, 1991
Daniel G Russ, deceased, late of Fort Wayne, IN (US);
Vilmer L Nichols, Fort Wayne, IN (US);
Steven E Modezjewski, Fort Wayne, IN (US);
Michael R Miller, Churubusco, IN (US);
Telectro-Mek, Inc., Fort Wayne, IN (US);
Abstract
A fuel contamination detection system for use in testing the contamination level of a fuel sample, wherein the system is selectively operable in a first mode as a particulate detector and in a second mode as a free water detector. A filter support slide includes two apertures and is adapted to support different sizes of filter elements over the apertures. In the particulate detector mode, the slide carries a pair of filter elements through which a fuel sample has been passed, wherein one filter element bears particulates from the sample. A particulate detection circuit includes an incandescent light and a photocell, between which the slide is moved to introduce one filter element and then the other, whereby a differential reading of their respective opacities is obtained and displayed. In the free water detector mode, only one aperture of the slide is used to carry a chemically treated water filter pad. A free water detector circuit includes an ultraviolet light and a photoresistor, adjacent which the slide is moved to expose the water filter pad to the ultraviolet such that the photoresistor responds to light fluorescing from the water filter pad, whereby a reading of the fluorescent light intensity is obtained and displayed. Optical switches cooperate with positioned holes in the filter support slide to provide slide position sensing that is used by the circuits for test sequencing and that provides visual prompts to a system operator.