Granted Patent
Utility
US 4,983,354 · App. 07/308,507
Uniform coarse tungsten carbide powder and cemented tungsten carbide article and process for producing same
Inventors:
David Reeder, Carlos A. Lopez, Jack Burwick
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Feb 10, 1989
Inventors
David Reeder
Carlos A. Lopez
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.