Granted Patent
Utility
US 6,591,521 · App. 09/963,979
Dipper door and dipper door assembly
Inventor:
Robert F. Brown
Patented Case
View Patent ↗
Granted: Jul 15, 2003
Filed: Sep 26, 2001
Inventor
Robert F. Brown
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.