Granted Patent
Utility
US 5,154,012 · App. 07/747,175
Support tub for dragline excavating machine
Inventor:
Harvey J. Kallenberger
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Aug 19, 1991
Inventor
Harvey J. Kallenberger
Assignee (at issue)
Harnischfeger Corporation
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.