Granted Patent
Utility
US 4,886,638 · App. 07/384,199
Method for producing metal carbide grade powders
Inventors:
Joseph J. Penkunas, Theodore E. Smith, Jr., Jack Burwick
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Jul 24, 1989
Inventors
Joseph J. Penkunas
Theodore E. Smith, Jr.
Jack Burwick
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.