Granted Patent
Utility
US 5,007,957 · App. 07/579,518
Method for producing tungsten carbide grade powders suitable for isostatic compaction
Inventors:
Joseph J. Penkunas, Theodore E. Smith, Jr.
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Sep 10, 1990
Inventors
Joseph J. Penkunas
Theodore E. Smith, Jr.
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.