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:
Feb. 29, 2000
Filed:
Aug. 18, 1997
Applicant:
Inventor:
Ushio Hase, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
436178 ; 204522 ; 204529 ; 204532 ; 436 73 ; 436150 ; 436161 ;
Abstract
Method of pre-treating a sample for metal analysis, the sample including a volatile alkali, by permeating the volatile alkali through a gas permeable membrane, dissolving the volatile alkali in an absorbent, passing ions through a first cation exchange membrane in electrical contact with an anode, reacting the volatile alkali with the ions, and passing the reacted volatile alkali through a second cation exchange membrane in electrical contact with a cathode, whereby the volatile alkali is removed from the sample.