Granted Patent
Utility
US 4,716,668 · App. 07/001,401
Excavating tooth point for use with basket spring retainer
Inventor:
Frederick C. Hahn
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Jan 8, 1987
Inventor
Frederick C. Hahn
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.