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. 04, 1997
Filed:
Mar. 30, 1995
David T Baron, Worcestershire, GB;
Alexander R Taylor, Ayrshire, GB;
Kuldip S Johal, Willenhall, GB;
Atotech USA, Inc., Somerset, NJ (US);
Abstract
An apparatus for removing polymer particles from the stripping solution used in the treatment of printed wireboards comprises passing a solution having resist particles dispersed therein over a screen having openings of 100 microns, where the screen is maintained at an angle of from 40 to 70.degree. to the horizontal. The apparatus comprises a curtain tube consisting of an inner concentric tube with a plurality of holes and an outer concentric tube with a slot wherein the position of the slot is adjustable, a filter comprising a screen, and a pump for circulating the solution. In one embodiment, the filter comprises a cylindrical screen. The stripping solution comprises an aqueous solution of an organoamine, ionic nitrogen compound or alkali or alkaline-earth hydroxide, or mixtures thereof.