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:
Feb. 21, 1995
Filed:
Mar. 05, 1993
Richard M Pieper, St. Paul, MN (US);
James E Aysta, Stillwater, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A method of performing a solid phase extraction on an aqueous fluid using a hydrophobic, solid-phase extraction medium (40), which method comprises: (a) placing (10) a hydrophobic, solid-phase extraction medium (40) inside of a pressurizable housing (18) having an inlet (25) and an outlet (32), the hydrophobic, solid-phase extraction medium (40) being positioned in the pressurizable housing (18) such that a liquid moving from the inlet (25) to the outlet (32) passes through the solid-phase extraction medium (40); (b) priming (12) the hydrophobic, solid-phase extraction medium (40) with a water-miscible organic liquid by passing the water-miscible organic liquid from the inlet (25) to the outlet (32) under positive pressure; and (c) passing (14) an aqueous liquid from the inlet (25) to the outlet (32) under positive pressure; wherein the water-miscible organic liquid and aqueous liquid are passed from the inlet (25) to the outlet (32) such that the solid-phase extraction medium (40) is completely and continuously immersed in liquid in the pressurizable housing (18) during steps (b) and (c).