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:
Mar. 23, 1999
Filed:
Jul. 03, 1997
Jeffrey J Theisen, Prior Lake, MN (US);
Kathryn A Legault, Bloomington, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A filter arrangement for filtering fluid comprises a housing having an inlet and an outlet, a first cylindrical construction, a second cylindrical construction, and a bypass arrangement. The first construction includes filter media mounted within the housing. The first construction defines a first open filter interior. The first open filter interior includes a first dimension being a largest dimension across a cross-section of the first open filter interior. The second construction includes a filtration construction mounted within the housing. The second construction defines a second open filter interior. The second open filter interior includes a second dimension being a largest dimension across a cross-section of the second open filter interior. The second dimension is at least as large as the first dimension. The bypass arrangement has an open position and a closed position. In the open position, the bypass arrangement is constructed and arranged to permit fluid flow from the housing inlet through the second filtration construction; in the closed position, the bypass arrangement is constructed and arranged to disallow fluid flow from the housing inlet and through the second filtration construction.