Granted Patent
Utility
US 6,589,640 · App. 10/065,602
Polycrystalline diamond partially depleted of catalyzing material
Inventors:
Nigel Dennis Griffin, Peter Raymond Hughes
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Nov 1, 2002
Inventors
Nigel Dennis Griffin
Peter Raymond Hughes
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.