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:
May. 07, 2002
Filed:
Oct. 20, 2000
Applicant:
Inventors:
Jon S. Wake, Verona, WI (US);
Donald E. Stiemke, Madison, WI (US);
James A. Bass, Madison, WI (US);
Mark V. Holzmann, Stoughton, WI (US);
Paul B. Rear, McFarland, WI (US);
Assignee:
Nelson Industries, Inc., Stoughton, WI (US);
Primary Examiner:
Int. Cl.
CPC ...
B01D 2/958 ; B01D 3/530 ;
U.S. Cl.
CPC ...
B01D 2/958 ; B01D 3/530 ;
Abstract
A filter ( ) has a housing ( ) extending along an axis ( ) between first and second axial ends ( and ), and has a closed loop primary filter element ( ) extending axially in the housing, and a closed loop safety filter element ( ) in the hollow interior ( ) of the primary filter element. A detent member ( ) engages and retains the end cap ( ) of the safety filter element independently of the primary filter element to retain the safety filter element in housing upon removal of the primary filter element from the housing.