Granted Patent
Utility
US 4,615,491 · App. 06/254,147
Gyratory crusher with automatic tramp iron release
Inventors:
Joseph Batch, Robert G. Stafford
Patented Case
View Patent ↗
Granted: Oct 7, 1986
Filed: Apr 14, 1981
Inventors
Joseph Batch
Robert G. Stafford
Assignee (at issue)
Telsmith Division Barber-Greene Company
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.