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. 20, 1990
Filed:
Dec. 26, 1989
Donald R Blevins, Baton Rouge, LA (US);
Gottlieb C Gaeke, Jr, Baton Rouge, LA (US);
Doni G Grande, Baton Rouge, LA (US);
Robert N Sanders, Baton Rouge, LA (US);
Ethyl Corporation, Richmond, VA (US);
Abstract
The apparatus of this invention provides an improved thermal conductivity detector for determination of low levels of gaseous impurities vaporized from solid samples. In particular, a hydrogen impurity vaporized from solid polysilicon beads can be determined down to a detectable limit of about 0.1 ppm by weight. The improvement is comprised of a syringe injection pump for calibration of the instrument, a computer for controlling the syringe infusion pump and for calculating the analytical results, and means for controlling pressure and mass flows of the gas streams.