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:
Nov. 29, 2011
Filed:
Sep. 11, 2006
Neal A. Rakow, Woodbury, MN (US);
James P. Mathers, Woodbury, MN (US);
Jun-ying Zhang, St. Paul, MN (US);
Dora M. Paolucci, St. Paul, MN (US);
Richard J. Poirier, White Bear Lake, MN (US);
Moses M. David, Woodbury, MN (US);
John E. Trend, St. Paul, MN (US);
Michael S. Wendland, North St. Paul, MN (US);
Neal A. Rakow, Woodbury, MN (US);
James P. Mathers, Woodbury, MN (US);
Jun-Ying Zhang, St. Paul, MN (US);
Dora M. Paolucci, St. Paul, MN (US);
Richard J. Poirier, White Bear Lake, MN (US);
Moses M. David, Woodbury, MN (US);
John E. Trend, St. Paul, MN (US);
Michael S. Wendland, North St. Paul, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A sorbent media protective device includes an enclosure having a gas inlet, gas outlet and a thin-film multilayer indicator. The thin-film multilayer indicator is proximate sorbent media that can sorb a vapor of interest flowing from the gas inlet towards the gas outlet. The indicator includes a porous detection layer whose optical thickness changes in the presence of the vapor, located between a semireflective layer and a reflective layer permeable to the vapor. With equilibration at the applied vapor concentration between at least a portion of the media and the vapor, the vapor can pass through the reflective layer into the detection layer and change the detection layer optical thickness sufficiently to cause a visibly discernible change in the indicator appearance if viewed through the semireflective layer.