Granted Patent
Utility
US 4,633,601 · App. 06/654,371
Excavating shovel
Inventors:
Robert S. Fleck, John S. Kreitzberg
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Sep 25, 1984
Inventors
Robert S. Fleck
John S. Kreitzberg
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.