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. 24, 1991
Filed:
Jan. 29, 1990
Applicant:
Inventors:
Roger F Bernards, Wellesley, MA (US);
Gordon Fisher, Sudbury, MA (US);
Wade Sonnenberg, Foxboro, MA (US);
Edward J Cerwonka, Woburn, MA (US);
Stewart Fisher, Sudbury, MA (US);
Assignee:
Shipley Company Inc., Newton, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25D / ;
U.S. Cl.
CPC ...
204 24 ; 204 521 ;
Abstract
The invention discloses the use of an additive for acid copper plating bath which is chosen based on criteria of creating a shift in the charge transfer overpotential of the bath; or alternatively, creating a differential overpotential between the surface of a high aspect ratio circuit board and the recesses of such boards. The additive may be a single or multi-component additive.