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:
Aug. 21, 1979
Filed:
Nov. 25, 1977
Milton L Jackson, Houston, TX (US);
Other;
Abstract
Apparatus for measurement of gases in a multiple component gas stream or sample is disclosed. A regulated pressure system delivers the gas to N thermal conductivity type detectors utilizing wheatstone bridges. The thermal conductivity detector utilizes a resistance heated element (one leg of the bridge) which heats a chamber, and the sample flow varies the heat by thermal conduction in the chamber. The circuit creates a feedback signal for purposes of stabilizing the temperature in the chamber at a specified level. As the feedback signal is varied as a result of the change in concentration in the sample flow, this change in feedback signal is a signal which is related to the input. The apparatus utilizes N wheatstone bridges and feedback circuits for a sample gas having N constituents which are operated at N distinct temperatures relative to one another, and the respective output signals from the N detector circuits have the form of N simultaneous equations to form an output signal indicative of the gas makeup of the N gases in the sample.