Granted Patent
Utility
US 6,187,068 · App. 09/167,196
Composite polycrystalline diamond compact with discrete particle size areas
Inventors:
Robert H. Frushour, Christopher J. Torbet
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Oct 6, 1998
Inventors
Robert H. Frushour
Christopher J. Torbet
Assignee (at issue)
Phoenix Crystal 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.