Granted Patent
Utility
US 5,645,617 · App. 08/523,868
Composite polycrystalline diamond compact with improved impact and thermal stability
Inventor:
Robert H. Frushour
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Sep 6, 1995
Inventor
Robert H. Frushour
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.