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. 17, 2015
Filed:
Oct. 23, 2009
Neal A. Rakow, Woodbury, MN (US);
Thomas W. Holmquist-brown, St. Paul, MN (US);
Brian L. Linzie, Stillwater, MN (US);
John C. Hulteen, Afton, MN (US);
Duane D. Fansler, Dresser, WI (US);
Richard J. Poirier, White Bear Lake, MN (US);
Vivek Bharti, Cottage Grove, MN (US);
Neal A. Rakow, Woodbury, MN (US);
Thomas W. Holmquist-Brown, St. Paul, MN (US);
Brian L. Linzie, Stillwater, MN (US);
John C. Hulteen, Afton, MN (US);
Duane D. Fansler, Dresser, WI (US);
Richard J. Poirier, White Bear Lake, MN (US);
Vivek Bharti, Cottage Grove, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A sensorthat detects a chemical such as an organic vapor. The sensorincludes a film that has a film bodythat includes a detection layerand that is responsive to the presence of a chemical by providing a color change. The film also includes an occluding layerthat has a first major surfaceand that is bound to the film bodybut is inert to the detection layerto preclude the occluding layerand the chemical from causing a color change in the film bodyin an areanormal to the first major surfaceof the occluding layer. A sensor having this construction can provide a distinctly visible image on the sensor, which may be helpful in evaluating the remaining life of a filter cartridge.