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:
Dec. 05, 2000
Filed:
Dec. 16, 1998
David F Andel, Lawrenceville, GA (US);
Nordson Corporation, Westlake, OH (US);
Abstract
A dual acting pump for dispensing pressurized liquids including a pump housing, a reciprocating pump shaft contained in a pumping chamber and at least one spring-biased check valve member. In the preferred embodiment, a spring-biased check valve member is connected to one end of the pump shaft for closing a flow passage in the pump shaft during movement in one direction and for opening the flow passage during movement in the opposite direction. Similar spring-biased check valves are connected to the pump inlet and pump outlet. The check valves comprise hollow balls and, in combination with the springs, this assures that liquid output from the pump is not reduced significantly when the pump shaft changes direction.