Granted Patent
Utility
US 4,871,213 · App. 07/238,841
Excavating apparatus with adjustable breaker bar
Inventor:
Raymond A. Hanson
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Aug 31, 1988
Inventor
Raymond A. Hanson
Assignee (at issue)
R. A. Hanson 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.