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:
May. 31, 1983
Filed:
Dec. 23, 1981
Applicant:
Inventors:
Melvin L Eilers, Chillicothe, IL (US);
Michael S Englund, Peoria, IL (US);
Assignee:
Caterpillar Tractor Co., Peoria, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
55 90 ; 55270 ; 55259 ; 55387 ; 55267 ; 73 23 ; 73 / ;
Abstract
An apparatus (10) and method for producing a gas having a controlled water vapor content is disclosed. Present methods of adding varying amounts of water to a gas containing nitric oxide may undesirably alter the composition of the gas. The present invention solves the above problem by providing an apparatus (10) and method for substantially fully saturating an unconditioned gas, subsequently removing water from a preselected portion of the saturated gas, and then mixing the preselected dry and saturated portions of the gas. The present invention is particularly useful in calibrating exhaust emission analyzers.