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. 20, 1980
Filed:
Feb. 28, 1978
Paul L Patterson, Walnut Creek, CA (US);
Varian Associates, Inc., Palo Alto, CA (US);
Abstract
An instrument for the analysis of a sample material to detect the presence of specific substances that thermally decompose into electronegative species comprises a sensitized surface, means for heating the sensitized surface in a gaseous environment to generate a gaseous boundary layer adjacent the sensitized surface, means for causing the sample material to interact with the sensitized surface to form negative ions, a collector electrode maintainable at a different electrical potential from the sensitized surface to cause a current of these negative ions to the collector electrode, and means for measuring the ion current. The sensitized surface is formed on a ceramic body that is impregnated with an alkali metal. The composition and temperature of the sensitized surface, and the composition of the gaseous boundary layer are selected according to the specific substance to be detected.