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:
Dec. 02, 2008
Filed:
Oct. 03, 2006
Tung-sheng Shih, Taipei Hsien, TW;
Da-toung Tang, Taipei, TW;
Chuen-jinn Tsai, Hsinchu, TW;
Cheng-sheng Chang, Hsinchu, TW;
Tung-Sheng Shih, Taipei Hsien, TW;
Da-Toung Tang, Taipei, TW;
Chuen-Jinn Tsai, Hsinchu, TW;
Cheng-Sheng Chang, Hsinchu, TW;
Institute of Occupational Safety and Health, Council of Labor Affairs, Taipei Hsien, TW;
Abstract
A three-stage dust sampler makes use of a porous foam as the impactor substrates. The sampler includes an annular inlet which conforms to ISO/CEN/ACGIH inhalable sampling criteria, two impactor stages to classify thoracic and respirable particles and a final filter to collect respirable particles after the impactors. For 100 ppi polymer foam substrates, and a flow rate of 3.2 lpm, the collection efficiency curves of the thoracic and respirable dust matches ISO/CEN/ACGIH criteria when the jet-to-plate distance is 1.0. The cut-off aerodynamic diameter is 9.6 and 4.0 μm for the first and second impactor stages, respectively, and √{square root over (stk)} is 0.39 for both stages. The collection efficiencies for solid particles is equal to that for liquid particles, indicating that there is no solid particle bouncing from the foam substrates.