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. 21, 1999
Filed:
Jul. 01, 1998
Applicant:
Inventors:
M Dalil Rahman, Flemington, NJ (US);
Carlo R Spilletti, Flemington, NJ (US);
Michelle M Cook, Somerville, NJ (US);
Assignee:
Clariant International Ltd., , CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
528482 ; 528491 ; 528499 ; 5285 / ; 528503 ; 521 25 ; 521 28 ; 430914 ; 210681 ; 210686 ; 210688 ;
Abstract
The present invention provides methods for solutions having a very low level of metal ions, utilizing a specially designed Ion Exchange Pack. A method is also provided for producing photoresist composition having a very low level of metal ions from novolak resins purified in a process using such an Ion Exchange Pack.