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:
Feb. 05, 2013
Filed:
May. 22, 2009
Applicants:
Richard J. Poirier, White Bear Lake, MN (US);
Thomas W. Holmquist-brown, St. Paul, MN (US);
Neal A. Rakow, Woodbury, MN (US);
Inventors:
Richard J. Poirier, White Bear Lake, MN (US);
Thomas W. Holmquist-Brown, St. Paul, MN (US);
Neal A. Rakow, Woodbury, MN (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A62B 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A filter cartridgethat includes a filter material, an end-of-service-life-indicator, a cartridge housing, and a window. The filter materialand ESLIare disposed in the housing, and the ESLImay be viewed through the window. The windowis configured such that the ESLIcan only be seen within a cone defined by an angle θ of 20 to 70 degrees. The limited viewing range precludes reader error when examining the ESLI for color change.