Granted Patent
Utility
US 6,592,985 · App. 09/682,042
Polycrystalline diamond partially depleted of catalyzing material
Inventors:
Nigel Dennis Griffin, Peter Raymond Hughes
Patented Case
View Patent ↗
Granted: Jul 15, 2003
Filed: Jul 13, 2001
Inventors
Nigel Dennis Griffin
Peter Raymond Hughes
Assignee (at issue)
Camco International (UK) Limited
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.