Apparatus for collection and transfer of particles

Apparatus having a particle-collecting and transferring filter, said apparatus comprising

• a tubular body having a planar rim at a first axial end spaced from a second axial end,
• a planar annular mounting surface disposed parallel to said planar rim and on the body between the axial ends radially outwardly of the rim,
• a filter comprising
• a filter portion spanning the first axial end and seated on the rim for disposition in a first plane defined by the rim, the filter portion having an outer screen surface, facing outwardly from the tubular body, for collecting thereon microscopic particles carried in a fluid, and for transferring such collected particles to a planar receiver brought into abutment with the particle carrying outer surface, and
• a mounting portion peripheral to the filter portion and extending from the rim and bonded to the annular mounting surface for securing the filter to the tubular support body, and
• barrier means for isolating the rim from distorting action developed at the mounting surface during bonding of the mounting portion of the filter to the mounting surface, said barrier means being a portion of the tubular body spanned by said filter mounting portion and defining a trough between the mounting surface and the rim.