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:
May. 17, 1977
Filed:
Feb. 18, 1975
Applicant:
Inventors:
Otto Blunck, Hamburg, DT;
Burkhart Seim, Ahrensburg, DT;
Karl-Heinz Retzow, Hamburg, DT;
Karl-Heinz Zorner, Norderstedt, DT;
Assignee:
Maihak AG, Hamburg, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
2323 / ; 2323 / ; 2325 / ; 2325 / ; 2325 / ;
Abstract
The concentration of gas is determined by monitoring the coloration of a reagent test paper, or the like, whose color changes progressively or otherwise in response to continued exposure to such gas. The concentration is determined by determining the length of time which the reagent test paper must be exposed to the gas for the coloration of the test paper to reach a preselected threshold value.