Granted Patent
Utility
US 4,640,496 · App. 06/720,301
Dump block for dragline bucket
Inventors:
Robert L. Van Hoomissen, Terry L. Briscoe, Don Barker
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Apr 4, 1985
Inventors
Robert L. Van Hoomissen
Terry L. Briscoe
Don Barker
Assignee (at issue)
ESCO GROUP LLC
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.