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:
Jun. 30, 2009
Filed:
Sep. 07, 2006
Fred L. Deroos, Woodbury, MN (US);
Mark E. Mueller, Marine-on-the-St. Croix, MN (US);
Mark A. Roehrig, Stillwater, MN (US);
Fred L. DeRoos, Woodbury, MN (US);
Mark E. Mueller, Marine-on-the-St. Croix, MN (US);
Mark A. Roehrig, Stillwater, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Fluid permeation testing involves filling a first cavity of a test cell with a test fluid and filling a second cavity of the test cell with a challenge fluid. The challenge fluid comprises at least one analyte useful for testing permeation of the challenge fluid through a test film that separates the first and second cavities. Samples of the test fluid in the first cavity are introduced to a mass spectrometer, such as in a pulsed manner, without substantially changing the total pressure in first cavity. Samples of the test fluid in the first cavity may be introduced to the mass spectrometer while maintaining substantially balanced total pressures in the first and second cavities.