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. 24, 1997
Filed:
May. 01, 1995
Applicant:
Inventor:
Donald C Grant, Excelsior, MN (US);
Assignee:
FSI International, Inc., Chaska, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ; H01F / ; B01D / ;
U.S. Cl.
CPC ...
73 6456 ; 73 6141 ; 422101 ; 137110 ; 137340 ; 13762528 ; 137559 ; 210607 ; 210765 ; 210805 ;
Abstract
A method for qualifying a chemical distribution system and components used therein to ensure that the quantity of contaminants extracted from the system by the chemical is below a predetermined specification level. A volume of the chemical is continuously circulated through the system. The concentrations of extracted contaminants in the chemical are periodically measured, and the contaminant extraction rate determined as a function of the measurements. The system is qualified for production when the extraction rate has decreased to the specification level.