Granted Patent
Utility
US 4,828,612 · App. 07/129,565
Surface modified cemented carbides
Inventor:
Warren C. Yohe
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Dec 7, 1987
Inventor
Warren C. Yohe
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.