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. 21, 2005
Filed:
Aug. 20, 2002
Holger Noerenberg, Oxford, GB;
Andrew Briggs, Oxford, GB;
George Smith, Witney, GB;
Yusuke Tsukahara, Tokyo, JP;
Takashi Miyamoto, Tokyo, JP;
Holger Noerenberg, Oxford, GB;
Andrew Briggs, Oxford, GB;
George Smith, Witney, GB;
Yusuke Tsukahara, Tokyo, JP;
Takashi Miyamoto, Tokyo, JP;
Toppan Printing Co., Ltd., Tokyo, JP;
Abstract
A method of measuring the rate of transmission of a vapor through a test sample using a mass spectrometer. The test sample is sealed to a gas cell defining a gas chamber, covering an opening in the gas chamber. A droplet of water including isotopes of mass number placed in the gas chamber and the gas cell is introduced into a vacuum chamber adjacent a mass spectrometer. After a sufficient time for evaporation of the liquid to saturate the gas chamber with vapor and for the output of the mass spectrometer to stabilize, the partial pressure of vapor in the vacuum chamber is measured using the mass spectrometer. The measure partial pressure is used to derive the rate of transmission of the vapor through the test sample.