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:
Aug. 11, 1987
Filed:
Feb. 03, 1986
Applicant:
Inventor:
Mark F Warchol, New Kensington, PA (US);
Assignee:
Aluminum Company of America, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 19 ; 73 / ; 73 2 / ;
Abstract
A single catharometer cell is employed in combination with a source of DC voltage and a device that provides constant electrical current for the cell. The constant current source provides a fixed reference for balancing against the electrical current flow through the cell when the cell contains only a carrier gas. An operational amplifier is connected across the cell and is adjustable to provide a desired output when a known amount of a second gas is present in the cell.