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:
Dec. 05, 2017
Filed:
Dec. 03, 2014
Applicant:
3m Innovative Properties Company, St. Paul, MN (US);
Inventors:
Andrew R. Fox, Oakdale, MN (US);
Liming Xin, Shanghai, CN;
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 46/00 (2006.01); F24F 3/16 (2006.01); F24F 11/00 (2006.01); G01N 15/06 (2006.01); G01N 1/22 (2006.01); G01N 15/00 (2006.01);
U.S. Cl.
CPC ...
B01D 46/0086 (2013.01); B01D 46/002 (2013.01); B01D 46/0032 (2013.01); F24F 3/1603 (2013.01); F24F 3/166 (2013.01); F24F 11/0017 (2013.01); G01N 1/2205 (2013.01); G01N 15/0618 (2013.01); G01N 15/0625 (2013.01); B01D 2267/40 (2013.01); F24F 2003/1614 (2013.01); F24F 2011/0093 (2013.01); G01N 2015/0046 (2013.01); Y02B 30/78 (2013.01);
Abstract
An air quality indicator for indicating high fine particle levels in an environment of interest. The indicator includes a frame maintaining first and second air filter media. The first air filter medium differs from the second air filter medium at least in terms of a change in visual appearance (e.g., color) when subjected to air flow containing fine particles.