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:
Oct. 08, 1991
Filed:
Nov. 02, 1989
Applicant:
Inventors:
Stephen E Long, Murrysville, PA (US);
Albert A Poli, Pittsburgh, PA (US);
Assignee:
Mine Safety Appliances Company, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
7386481 ; 73 3107 ; 7386323 ;
Abstract
A gas analyzer comprises a diffusion filter to segregate sampled gases containing liquid and particulate solid contaminants from the analyzer. A gas permeable diffusion membrane separates a flowing stream of dirty sample gas from a closed circuit clean gas stream circulated through an analyzer. The membrane does not pass liquids or particulate solids but does permit rapid diffusion of gases so the gas composition in the closed circuit rapidly reaches equilibrium with the sample gas.