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:
Dec. 18, 2001
Filed:
Nov. 16, 1998
Allan B. Owen, Exton, PA (US);
Vickers, Incorporated, Maumee, OH (US);
Abstract
The presence of particulate debris flowing in a hydraulic fluid flow system includes a source of infra-red light passing through a window of the fluid flow line while fluid is flowing therethrough. A portion of the light is directed to a monitoring photodiode prior to reaching the fluid flow line. A detector photodiode is positioned to receive light passing through the flow line, the hydraulic fluid flowing therethrough and out of a second window. A trap is positioned between the hydraulic fluid flow line and the detector photodiode to prevent the direct rays of light from reaching the detector photodiode while permitting scattered light to reach the detector photodiode. A reduction in the amount of light reaching the detector photodiode results in an alarm being activated.