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:
Sep. 09, 2014
Filed:
Nov. 13, 2012
Applicant:
Valco Instruments Company, L.p., Houston, TX (US);
Inventors:
Stanley D. Stearns, Houston, TX (US);
Huamin Cai, Houston, TX (US);
Assignee:
Valco Instruments Company, L.P., Houston, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
G01N 27/62 (2006.01); H01J 49/00 (2006.01); G01N 27/66 (2006.01); H01J 49/10 (2006.01); G01N 27/64 (2006.01); G01N 30/64 (2006.01);
U.S. Cl.
CPC ...
G01N 27/66 (2013.01); H01J 49/107 (2013.01); G01N 27/64 (2013.01); G01N 30/64 (2013.01); G01N 2030/642 (2013.01);
Abstract
A detector for gas chromatography using two ionization sources within a single body to separately provide ionization energy to a column gas eluent to provide electrical discharge to two or more collecting electrodes provides improved selectivity and may be so used. Use is made of combined bias/collecting electrodes. The use of two ionization sources permits generation of two detector outputs from within a common body and of a common constituent flow. The ionization sources and any applicable discharge gas and dopant may be selected based on desired selectivity.