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:
Nov. 27, 1990
Filed:
Sep. 27, 1988
Applicant:
Inventors:
Benjamin Y Liu, North Oaks, MN (US);
Virgil A Marple, Maple Plain, MN (US);
Assignee:
Regents of the University of Minnesota, Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B07B / ;
U.S. Cl.
CPC ...
209143 ; 55510 ; 72 2805 ;
Abstract
A particle concentrating sampler utilizes a virtual impactor, which is an inertial classifier, for concentrating airborne particles above a cut size into a smaller volume air. The concentrated particles are counted, or collected on impactor plates or by using other collection techniques, such as filters or electrostatic precipitators. The concentration of the larger particles which are of interest for analysis insures that the number of particles, particularly in clean room environments, is sufficient so that a significant sampler or count can be obtained without sampling large volumes of air.