Granted Patent
Utility
US 4,817,857 · App. 07/061,766
Process for restricted lead content soldering of copper with controlled copper contamination of the molten solder reservoir
Inventors:
Homer G. Hargrove, Jay L. Kratz
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Jun 15, 1987
Inventors
Homer G. Hargrove
Jay L. Kratz
Assignee (at issue)
Westinghouse Electric Company LLC
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.