Granted Patent
Utility
US 6,168,542 · App. 09/249,186
Crowd rope take-up system for mining shovel
Inventor:
Shyue-Sheng Chang
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Feb 12, 1999
Inventor
Shyue-Sheng Chang
Assignee (at issue)
Bucyrus Intl. 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.