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. 15, 2006
Filed:
Dec. 11, 2000
Taizou Itou, Kanagawa, JP;
Hideki Hayashida, Kanagawa, JP;
Yasuhiro Kosuge, Kanagawa, JP;
Fumiyasu Ishigaki, Kanagawa, JP;
Taizou Itou, Kanagawa, JP;
Hideki Hayashida, Kanagawa, JP;
Yasuhiro Kosuge, Kanagawa, JP;
Fumiyasu Ishigaki, Kanagawa, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
Method and apparatus for measuring a water concentration in ammonia, comprising using ammonia having a water concentration of 10 ppm or less as a reference gas, introducing the ammonia at a constant flow rate into a multi-reflection long optical path gas cell, and measuring infrared absorption intensity of water at at least one measurement wave number in the range of from 3,500 to 4,000 cm, from 2,600 to 3,100 cm, or from 1,900 to 2,400 cmat which infrared absorptions of ammonia and water do not overlap. According to the present invention, analysis of water in a low concentration range of 10 ppm or less in ammonia gas and liquefied ammonia can be performed in a simple and convenient manner.