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:
Mar. 13, 2001
Filed:
Jan. 14, 1997
Applicant:
Inventors:
Anthony Zampini, Westborough, MA (US);
Harold F. Sandford, Groton, MA (US);
Assignee:
Shipley Company, L.L.C., Marlborough, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 1/504 ;
U.S. Cl.
CPC ...
B01D 1/504 ;
Abstract
The invention is for a process of removing acid salt contaminants from a resin solution. The process comprises providing an organic solution of a phenolic resin having a portion of its phenolic hydroxyl groups condensed with an acid halide in the presence of a base catalyst. The organic solutions is then contacted with a strong acid cation exchange resin and a base anion exchange resin for a time sufficient to remove essentially all of said acid salt contaminants. Acid salt contamination is reduced to a level below normal detection limits.