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:
May. 07, 1991
Filed:
Jan. 16, 1990
Emilio Meyer, Assago-Milano, IT;
Panametrics, Inc., Waltham, MA (US);
Abstract
Apparatus for measuring concentration of a paramagnetic gas in a gas mixture includes first and second magnet pole pieces positioned adjacent each other with a selected gap therebetween, for generating an inhomogeneous magnetic field. The pole pieces have a selected sectional shape, and a gap-facing surface with a selected configuration, that provide an elongated region of maximum magnetic field intensity in the gap. Electrically heated magnetic wind generating thermistors are positioned in the gap. Electrically heated magnetic wind sensing thermistors are positioned adjacent to the magnetic wind generating thermistors, proximate to the elongated region of maximum magnetic field intensity, such that a heated region associated with the wind generating and wind sensing thermistors is substantially encompassed by the elongated region of maximum magnetic field intensity. Consequently, only gas substantially within the region of maximum magnetic field intensity is subjected to heating and reduction of magnetic susceptibility, whereby gas outside the region of maximum magnetic field intensity is attracted with a selected maximum force.