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:
Jun. 11, 2002
Filed:
Mar. 14, 2000
Jon C. Volkwein, Canonsburg, PA (US);
Steven J. Page, Pittsburgh, PA (US);
Harry DoBroski, Jr., Burgettstown, PA (US);
Abstract
A personal sampling method and apparatus for real time respirable dust dosimetry for dust exposure assessment is provided to aid in assuring the respiratory health of workers. An embodiment uses a low flow-rate gas sampling pump for differential pressure measurements across a glass fiber collection filter in a disposable detector tube ( ) or dust detecting device coupled to the pump inlet. The dust detecting device includes an elongated tubular element ( ) having the filter ( ) positioned between proximal and distal ends of the tube ( ) for trapping dust mass. A pressure transducer ( ) at the proximal end ( ) measures the pressure from the flow of gas. The pump draws the flow of gas through the dust detecting device from the distal end ( ) towards the proximal end ( ) trapping the dust mass at the filter ( ). A differential pressure across the filter ( ) determined using the pressure from the flow of the gas in the proximal end ( ) of the tubular element measured by the pressure transducer ( ) is indicative of cumulative dust mass trapped at the filter ( ).