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:
Jun. 09, 1998
Filed:
Jul. 31, 1996
Brad E Kahlbaugh, Roseville, MN (US);
Susan B Reinhart, Minneapolis, MN (US);
Denis J Dudrey, Bloomington, MN (US);
John T Herman, Dellwood, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A filter construction includes a cylindrical pleated filter construction embedded in, and extending between, first and second end caps; and an inner liner positioned downstream from the cylindrical pleated filter. At least two regions of media are positioned upstream from the cylindrical pleated filter construction. The first region of media includes an upstream, region of media including a fibrous media having a percent solidity, within the filter construction, of no greater than about 3%. The second region of media is positioned downstream from the first region of media, and is upstream from the cylindrical pleated filter construction. The second region of media includes a material having, within the filter construction, a different efficiency of filtering than the first region of media.