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:
Aug. 16, 2011
Filed:
Jan. 31, 2003
Applicants:
Patrick Golden, Roseville, MN (US);
Gregory L. Reichter, Bloomington, MN (US);
Daniel T. Risch, Burnsville, MN (US);
Inventors:
Patrick Golden, Roseville, MN (US);
Gregory L. Reichter, Bloomington, MN (US);
Daniel T. Risch, Burnsville, MN (US);
Assignee:
Donaldson Company, Inc., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 46/52 (2006.01); B01D 27/06 (2006.01); B01D 39/00 (2006.01); B29C 65/00 (2006.01); B29C 63/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fluted filter medium () comprising a corrugated filter sheet, where each flute () has an end closure defined by a regular fold arrangement in the corresponding corrugation. Each regular fold arrangement has at least four folds. A process for manufacturing the fluted filter medium comprising deforming a portion of each corrugation to define at least one foldable tip, and folding the said tip in order to close the corrugation.