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:
Mar. 20, 2001
Filed:
Jan. 05, 1999
William Curtis Kottke, Fogelsville, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
A reciprocating pump includes a cylinder with a closed interior compartment. A piston assembly has a dispensing end and an opposed end and is moveably mounted within the compartment for reciprocating movement in opposed linear directions between opposed ends of the closed interior compartment. A linear magnetic drive generates a linearly moving magnetic field for moving the piston assembly in opposed linear directions through a swept volume in each of said opposed linear directions, one of said linear directions being a dispensing stroke and the other of said linear directions being a suction stroke. A sealing member is provided between the cylinder and the piston assembly to divide the interior compartment of the cylinder into a dispensing chamber and a reservoir chamber. A valve-controlled inlet conduit communicates with the dispensing chamber from which liquid is dispensed and a valve-controlled outlet conduit communicates with the dispensing chamber for directing pumped liquid out of the interior compartment as the piston assembly is moved through the swept volume in a dispensing stroke. An energy storage and release media communicates with the reservoir chamber for storing energy as a result of movement of the piston assembly in a direction away from the dispensing end of the interior compartment and for releasing the stored energy as the piston assembly is moved in a direction toward the dispensing end of the interior compartment. In certain preferred embodiments, the pumps are hermetic and the energy storage and release media includes a gaseous substance in the reservoir chamber. Methods of pumping liquids with the pumps of this invention also constitute a part of the present invention.