Raymond S Holmgren

US Patent:

43188036, Mar 9, 1982

Filed:

Jul 14, 1980

Appl. No.:

6/167926

Inventors:

Raymond S. Holmgren - Portland OR

International Classification:

B03B 700

US Classification:

209 17

Abstract:

An apparatus for preparing a liquid suspension of particles, such as an aqueous suspension of parasite eggs, for microscopic examination. The apparatus includes a vial for holding the suspension and a plunger in the form of a tubular cup having a perforated base through which the suspension is displaced, upwardly into the cup, as the plunger is lowered into the vial. The plunger's base functions as a filter selective for particle size. The apparatus is intended to be used by placing at least a predetermined amount of suspension in the vial, and inserting the plunger in the vial until a convex crown forms at the plunger's open upper end. The suspension particles are collected by touching an examination slide to the crown so formed.