Granted Patent
Utility
US 4,267,653 · App. 06/112,160
Locking device for excavating equipment
Inventors:
Frederick C. Hahn, Larren F. Jones
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Jan 16, 1980
Inventors
Frederick C. Hahn
Larren F. Jones
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.