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. 21, 1989
Filed:
Dec. 14, 1987
Applicant:
Inventors:
Gary B Larson, Cheshire, CT (US);
Ann S Williams, Southbury, CT (US);
Raymond A Letize, West Haven, CT (US);
Assignee:
MacDermid, Incorporated, Waterbury, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; B44C / ; C03C / ;
U.S. Cl.
CPC ...
156652 ; 156656 ; 156666 ; 156901 ; 29847 ; 29852 ;
Abstract
A method of preparing printed circuit boards is described in which the solder mask is applied over a thin layer of copper oxide covering the copper circuit traces, the copper oxide layer being that which remains after stripping the tin or tin-lead alloy etch resist.