Filter cassette
AssigneeEnvironmental Safety Products, Inc.
InventorsCharles Trayford, III, Jeffrey M. Petrizzi
Life of this patent
Estimating the term…
Abstract
A filter cassette for sampling of airborne substances comprising a body section having an air flow passageway that extends through the body section from an air inlet to an air outlet. A filter medium inside the body section is disposed across the air flow passageway for capturing airborne substances flowing through the passageway. The portion of the passageway directly downstream from the filter medium has a uniform frusto-conical contour converging in the direction of flow. The air inlet comprises openings in the body section upstream from the filter medium, the openings being arranged to direct air into the air flow passageway normal to the direction of flow onto the filter medium.
Claims14
A filter cassette for the sampling of airborne substances which comprises a body section having an outside surface and an air flow passageway extending through the body section from an air inlet to an air outlet, a filter medium inside the body section disposed across the air flow passageway for capturing airborne substances flowing through the passageway, the passageway portion directly downstream from the filter medium having a uniform frusto-conical contour converging in the direction of flow and the passageway portion downstream from the uniform frusto-conical contour being centrally positioned relative to the filter medium, and the air inlet comprising openings in the body section extending through the outside surface thereof upstream from the filter medium arranged to direct air into the air flow passageway normal to the direction of flow onto the filter medium.
Dependencies are inferred from the claim text.