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:
Apr. 20, 1999
Filed:
Apr. 26, 1996
Francis A Friedmann, South St. Paul, MN (US);
Gary R Gillingham, Prior Lake, MN (US);
Bernard A Matthys, Apple Valley, MN (US);
Daniel T Risch, Burnsville, MN (US);
Wayne M Wagner, Apple Valley, MN (US);
Fred H Wahlquist, Bloomington, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A filter apparatus includes a fluted filter element in a filter housing having a first open end and a second closed end. The filter element includes fluted filter media coiled into a cylindrical shape and may include an end cap for support and fluid control. Fluid flows into the open end and either around the filter to the closed and back through the filter element or through the filter element to the closed end and then back through a central opening in the filter element.