Granted Patent
Utility
US 4,990,195 · App. 07/293,030
Process for producing tungsten heavy alloys
Inventors:
James R. Spencer, James A. Mullendore
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jan 3, 1989
Inventors
James R. Spencer
James A. Mullendore
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.