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:
Oct. 11, 1977
Filed:
Feb. 26, 1976
Clifford C Hach, Ames, IA (US);
Michael D Buck, Ames, IA (US);
Hach Chemical Company, Ames, IA (US);
Abstract
A portion of a colorimetric liquid analyzer including a glass tube cell, a plunger mounted for reciprocation in the cell and having a passage to the cell, and a long liquid sample supply tube running from a body of liquid to be tested to the plunger passage. A 'T' connector is provided in the tube and a pair of on-off valves which, together with the plunger, act to pump fixed volumes of fluid into and out of the cell. Means are provided to pump substantial air bubbles into the tube near its intake end, and the air bubbles are separated from the liquid through a vertical section of the T-connector so that only liquid is pumped into the cell. Preferably, acid is also added to the tube at its intake end to help dissolve particulate matter while the air bubbles continuously sweep the tube clean.