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:
Sep. 18, 2012
Filed:
Feb. 11, 2008
Wayne M. Wagner, Apple Valley, MN (US);
Gary R. Gillingham, Prior Lake, MN (US);
Joseph C. Tokar, Apple Valley, MN (US);
Daniel T. Risch, Burnsville, MN (US);
Jim C. Rothman, Burnsville, MN (US);
Fred H. Wahlquist, Bloomington, MN (US);
Bernard A. Matthys, Apple Valley, MN (US);
Gregory L. Reichter, Bloomington, MN (US);
Stephen W. Sabelko, Prescott, WI (US);
Bryan D. Patten, Bloomington, MN (US);
Wayne M. Wagner, Apple Valley, MN (US);
Gary R. Gillingham, Prior Lake, MN (US);
Joseph C. Tokar, Apple Valley, MN (US);
Daniel T. Risch, Burnsville, MN (US);
Jim C. Rothman, Burnsville, MN (US);
Fred H. Wahlquist, Bloomington, MN (US);
Bernard A. Matthys, Apple Valley, MN (US);
Gregory L. Reichter, Bloomington, MN (US);
Stephen W. Sabelko, Prescott, WI (US);
Bryan D. Patten, Bloomington, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
Fluted filter media includes filter material having a plurality of flutes formed therein having alternating ends of adjacent flutes closed to force fluid through filter material. A first embodiment of the filter media includes tapered flutes which have the open ends of the flutes larger in cross-section than the closed flutes, wherein the upstream open flutes converge toward the downstream end and the upstream closed end flutes diverge toward the downstream end. A second embodiment includes filter media which is asymmetric formed with dissimilar upstream and downstream flute cross-sections with larger flute openings to the upstream side of the filter. A third embodiment includes filter media with an upstream edge crushed to improve flow at the upstream edge. A fourth embodiment includes filter media with the upstream sealing material recessed from the upstream edge for reducing effects from blockages at the upstream edge of the filter.