Filter vial
AssigneeScientific Plastic Products, Inc.
InventorsSamuel A. Ellis, Kishan G. Hingorani
Life of this patent
Estimating the term…
Abstract
A filter vial for separating biological and chemical fluids has a cylindrical sidewall with an open top and a closed bottom. A protrusion extends upwards from the middle of the bottom to form an annular recess. A tubular plunger has an open bottom end to which is fastened an annular cup having an outer sidewall sized to fit into and seal against the vial's sidewall. An inner sidewall of the annular cup holds a filter over an opening in the bottom of the plunger and forms a shaped cavity leading to that filter. The annular cup on the plunger fits into the annular recess in the vial to force fluid from the vial through the filter and into the plunger.
Claims22
1-44. (canceled)
A tubular plunger assembly for filtering liquids, comprising:
- a tubular plunger assembly having a cylindrical body extending along a longitudinal axis to enclose a liquid cavity in the plunger, the plunger assembly having a bottom end with a shaped cavity in liquid communication with the liquid cavity, the bottom end configured to block the passage of liquid except through the shaped cavity, the plunger assembly having at least one piston seal encircling the longitudinal axis and an outer circumference of the plunger assembly, the piston seal located adjacent the bottom end of the piston assembly;
- a filter connected to the plunger assembly and interposed between the shaped cavity and the liquid cavity in the plunger and connected to the plunger assembly to filter all liquid passing through the shaped cavity and into the liquid cavity of the plunger.
- wherein the plunger has a cross section orthogonal to the longitudinal axis that is circular.
Dependencies are inferred from the claim text.