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:
Jul. 06, 1976
Filed:
May. 23, 1974
Applicant:
Inventors:
Edward Etess, La Jolla, CA (US);
Allan L Budd, San Diego, CA (US);
Assignee:
Monitor Labs, Inc., San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
2323 / ; 2323 / ; 2325 / ; 2325 / ; 2325 / ; 2325 / ; 250361 ;
Abstract
Sample air is divided into two paths. One path leads through a thermal converter where ambient NO.sub.2 is changed into NO. The other path passes through equivalent tubing to keep the air samples synchronized. Both samples then go to separate cells where each combines with ozone. The resulting chemical reaction produces light, chemiluminescence, which is measured by separate photo-multiplier tubes. Electronic circuits translate the results into simultaneous readings of NO.sub.x and NO concentrations. A difference amplifier subtracts the NO from the NO.sub.x to give a continuous NO.sub.2 value.