Granted Patent
Utility
US 5,676,471 · App. 08/537,300
Dragline with improved thrust bearing assembly supporting upper structure
Inventors:
Harvey J. Kallenberger, Joseph L. Huffman
Patented Case
View Patent ↗
Granted: Oct 14, 1997
Filed: Sep 29, 1995
Inventors
Harvey J. Kallenberger
Joseph L. Huffman
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.