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:
Nov. 04, 2003
Filed:
Jun. 18, 2002
Kent J. Kallsen, Oregon, WI (US);
Tadeusz Jaroszczyk, Stoughton, WI (US);
Stephen L. Fallon, Madison, WI (US);
Z. Gerald Liu, Madison, WI (US);
Jerald J. Moy, Stoughton, WI (US);
Jeffrey S. Morgan, Stoughton, WI (US);
Michael J. Connor, Stoughton, WI (US);
Scott P. Heckel, Stoughton, WI (US);
Jon S. Wake, Verona, WI (US);
Nelson Industries, Inc., Stoughton, WI (US);
Abstract
An open flow fluid filter has a pleated main filter element having a plurality of pleats in a closed loop having an outer perimeter defined by a plurality of outer pleat tips, and an inner perimeter defined by a plurality of inner pleat tips. The loop has a hollow interior extending along an axis. Fluid to be filtered flows through the main filter element from an upstream dirty side to a downstream clean side, and flows axially in the hollow interior. The main filter element has an axial flow passage extending along the axis and circumscribing the hollow interior and has a flow perimeter greater than the inner perimeter. A safety filter element downstream of the main filter element filters both the axial flow in the hollow interior and additional flow between the flow perimeter and the inner perimeter. A filter with additional flow is also provided.