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. 18, 1989
Filed:
Aug. 14, 1987
Applicant:
Inventors:
Michael D Brandt, Chicago, IL (US);
Francois Mermoud, Westmont, IL (US);
Assignee:
American Air Liquide, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; A24F / ;
U.S. Cl.
CPC ...
422 62 ; 422 83 ; 239 34 ;
Abstract
A device adapted to generate a gas flow containing a precise amount of impurities. The device comprises a membrane through which an impurity gas peremeates and mixing means to make a mixture of said impurity gas and a vector gas sweeping said membrane. The pressure of said mixture is substantially constant, but adjustable, to enhance the accuracy of the device.