Granted Patent
Utility
US 4,559,852 · App. 06/625,479
Method for shanking rock bits
Inventor:
Gerald O. Atkinson
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: Jun 28, 1984
Inventor
Gerald O. Atkinson
Assignee (at issue)
Hughes Tool Company - USA
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.