Granted Patent
Utility
US 5,398,433 · App. 08/014,502
Bucket dump block
Inventor:
Andrew P. Dretzka
Patented Case
View Patent ↗
Granted: Mar 21, 1995
Filed: Feb 8, 1993
Inventor
Andrew P. Dretzka
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.