Granted Patent
Utility
US 4,389,074 · App. 06/322,607
Mine tools utilizing copper-manganese nickel brazing alloys
Inventor:
Mark S. Greenfield
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Nov 18, 1981
Inventor
Mark S. Greenfield
Assignee (at issue)
GTE Products Corporation
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.