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:
Jan. 12, 1999
Filed:
Jul. 29, 1997
Applicant:
Inventors:
Kenneth C Cole, Quebec, CA;
Eric Pellerin, Quebec, CA;
Assignee:
National Research Council of Canada, Ottawa, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C08K / ;
U.S. Cl.
CPC ...
106 1442 ; 106 1415 ; 106 1416 ; 106 1441 ; 106 1443 ; 252390 ; 252391 ; 252392 ;
Abstract
Known organic solderability preservatives (OSP) contain an azole compound and are applied on a copper surface from an acidic solution. The OSPs are not visible to the naked eye when applied. A number of dyes compatible with the OSP solution and not interfering with solderability has been identified. The composition containing such a dye can produce a layer which is visible to the naked eye when applied even in a thin layer. The suitable dyes contain a cationic imine group having the general formula ##STR1## where X.sup.- is an anion such as chloride, iodide, sulphate, etc., or an organically bonded anionic group such as sulphonate.