Granted Patent
Utility
US 4,231,173 · App. 05/966,517
Excavating tooth
Inventor:
Kerwin L. Davis
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Dec 4, 1978
Inventor
Kerwin L. Davis
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.