Granted Patent
Utility
US 6,725,951 · App. 09/964,057
Erosion resistent drilling head assembly
Inventor:
Patrick Looper
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Sep 27, 2001
Inventor
Patrick Looper
Assignee (at issue)
Diamond Rotating Heads, Inc.
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.