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. 29, 1977
Filed:
Jan. 19, 1976
Robert A Pontefract, Chelmsford, MA (US);
Jerguson Gaga and Valve Company, Burlington, MA (US);
Abstract
A liquid level gauge having a body defining a liquid receiving chamber, a transparent reflex glass at an open face of the body chamber for maintaining liquid within the chamber while providing visual access into the chamber, a removable cover plate maintaining the reflex glass in sealing engagement with the chamber body, the reflex glass including on its inner face a plurality of longitudinally extending prisms adapted to be contacted by liquid in the chamber, a background plate within the walls of the chamber, and means to space the background plate from the reflex body to permit circulation of liquid therebetween, the background plate displaying through the reflex glass a high visual contrast, e.g., a bright color, between wetted and nonwetted areas of the reflex glass. As disclosed, the reflex glass may be formed of a transparent plastic material and be arranged with a relatively thin cross section to permit its use as an insert for assembly with an outwardly disposed primary pressure-retaining glass.