Granted Patent
Utility
US 4,957,653 · App. 07/334,918
Composition containing alkane sulfonic acid and ferric nitrate for stripping tin or tin-lead alloy from copper surfaces, and method for stripping tin or tin-lead alloy
Inventor:
John L. Cordani
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Apr 7, 1989
Inventor
John L. Cordani
Assignee (at issue)
MacDermid, Incorporated
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.