Granted Patent
Utility
US 4,335,532 · App. 06/235,771
Excavating tooth
Inventors:
Frederick C. Hahn, William R. Barber, Jr., David A. Hampel
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Feb 25, 1981
Inventors
Frederick C. Hahn
William R. Barber, Jr.
David A. Hampel
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.