Granted Patent
Utility
US 5,140,761 · App. 07/813,356
Dragline bucket line protection device
Inventors:
Ralph E. Coffman, Joseph B. Kumpf
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Dec 24, 1991
Inventors
Ralph E. Coffman
Joseph B. Kumpf
Assignee (at issue)
Dresser Industries, Inc.
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.