Granted Patent
Utility
US 4,811,505 · App. 07/155,892
Excavating tooth assembly
Inventor:
Robert K. Emrich
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Feb 16, 1988
Inventor
Robert K. Emrich
Assignee (at issue)
ESCO GROUP 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.