Granted Patent
Utility
US 4,316,515 · App. 06/043,533
Shaft drill bit with improved cutter bearing and seal arrangement and cutter insert arrangement
Inventor:
Rudolph C. O. Pessier
Patented Case
View Patent ↗
Granted: Feb 23, 1982
Filed: May 29, 1979
Inventor
Rudolph C. O. Pessier
Assignee (at issue)
Hughes Tool Company LLC
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.