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:
Jul. 04, 1989
Filed:
Jul. 17, 1987
James Rasmussen, Plainville, MA (US);
Theodore S Geiselman, Groveland, MA (US);
Fisher Scientific Company, Pittsburgh, PA (US);
Abstract
A liquid monitoring system includes chamber structure with a monitoring region in which the liquid to be monitored is disposed, the monitoring region having two spaced wall portions and a supplemental wall portion. The system further includes a radiation source mounted adjacent one of the spaced wall portions or directing a beam of radiation along a horizontal path, and a sensor mounted adjacent the opposed wall portion for receiving radiation in a beam path. The incident radiation beam as it passes through the wall into the monitoring region is refracted at the region surface as a function of gas or liquid within the region. At a first refracting angle, the refracted beam impinges on the supplemental wall and is internally reflected, the reflected radiation passing along a reflected beam path and sensed by the detector to provide an indication of the fluid in the chamber. At a second refracting angle, the refracted beam is not reflected in a direction such that radiation from the source is sensed.