03973914 is referenced by 13 patents and cites 2 patents.

A mixture of ferrous sulphate and alkali metal acid sulphate used in a reducer employed for converting NO.sub.2 to NO in an apparatus for determining the nitrogen oxide content of air by means of the measurement of the reaction of ozone and NO.

Title
Apparatus for the determination of nitrogen oxides in air
Application Number
5/529123
Publication Number
3973914
Application Date
December 3, 1974
Publication Date
August 10, 1976
Inventor
Sybrandus VAN Heusden
Eindhoven
NL
Agent
Norman N Spain
Frank R Trifari
Assignee
U S Philips Corporation
NY, US
IPC
C09K 3/00
C01B 21/24
G01N 31/00
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