Granted Patent
Utility
US 4,974,521 · App. 07/208,596
Friction casting for a bolster pocket
Inventor:
William C. Eungard
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Jun 20, 1988
Inventor
William C. Eungard
Assignee (at issue)
STANDARD CAR TRUCK 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.