JOHN W REX
Engineers in Pittsburgh, PA
License number
Pennsylvania PE000747K
Category
Engineers
Type
Professional Engineer
Address
Address
Pittsburgh, PA 15243
Professional information
Method And Apparatus For Temperature Controlled Samplers
US Patent:
4119403, Oct 10, 1978
Filed:
Jun 15, 1977
Appl. No.:
5/806645
Inventors:
John Walter Rex - Pittsburgh PA
Assignee:
W. R. Grace & Co. - New York NY
International Classification:
G01N 3106
US Classification:
23232R
Abstract:
The invention pertains to "wet chemistry" analytical devices for pollutant gases in air. Numerous improvements are provided including a thermo-electric heating/cooling device which uses the atmosphere as a heat sump. Critical flow means to maintain constant pressure throughout the system is also provided.