Granted Patent
Utility
US 5,334,240 · App. 07/532,372
Aqueous acidic tin-lead immersion plating bath containing weak acid and weak base
Inventor:
Donald Ferrier
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Jun 4, 1990
Inventor
Donald Ferrier
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.