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. 26, 2002
Filed:
Aug. 24, 1998
Applicant:
Inventors:
Tohru Tanaka, Tokyo, JP;
Takayoshi Hayashi, Tokyo, JP;
Shiro Matsumoto, Tokyo, JP;
Yasuko Maruo, Tokyo, JP;
Takashi Ohyama, Tokyo, JP;
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 3/300 ; G01N 2/101 ; G01N 2/125 ; G01N 3/122 ;
U.S. Cl.
CPC ...
G01N 3/300 ; G01N 2/101 ; G01N 2/125 ; G01N 3/122 ;
Abstract
In this invention, a mixture of a diazotizing reagent which reacts with nitrous ions to produce a diazo compound, a coupling reagent which couples with a diazo compound to produce an azo dye, and an acid is placed in pores of a transparent porous body to prepare a sensor element. Nitrogen dioxide gas is sensed in accordance with a color change before and after the sensor element is exposed to air to be measured for a predetermined time.