Granted Patent
Utility
US 4,889,193 · App. 07/204,703
Rotary drill guard assembly and method
Inventor:
Max H. Shy
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Jun 10, 1988
Inventor
Max H. Shy
Assignee (at issue)
McLaughlin Manufacturing Company, 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.