Granted Patent
Utility
US 4,321,813 · App. 06/127,998
Pusher block for rotary forging machines and method of using same
Inventor:
Bruce Hershock
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Jan 7, 1980
Inventor
Bruce Hershock
Assignee (at issue)
Caterpillar Tractor Co.
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.