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:
Jun. 16, 1981
Filed:
Dec. 21, 1978
Applicant:
Inventor:
Norvell J Nelson, Palo Alto, CA (US);
Assignee:
Varian Associates, Inc., Palo Alto, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
2323 / ; 422 54 ; 2323 / ;
Abstract
An alkali flame ionization detector having an independently biased activator intermediate the flame tip member and the ion collector has been found to yield ion current collector signals which will be selectively positive-going, negative-going or null in response to selected ionic species at an appropriately chosen value of bias potential. Elemental specificity has been found for those values of bias potential which produce a null signal in the presence of a sample.