Granted Patent
Utility
US 4,963,183 · App. 07/318,865
Corrosion resistant cemented carbide
Inventor:
Joonypyo Hong
Patented Case
View Patent ↗
Granted: Oct 16, 1990
Filed: Mar 3, 1989
Inventor
Joonypyo Hong
Assignee (at issue)
GTE Valenite 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.