Granted Patent
Utility
US 4,739,889 · App. 06/912,306
Railway cushioning apparatus
Inventor:
Charles T. Bomgardner
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Sep 25, 1986
Inventor
Charles T. Bomgardner
Assignee (at issue)
Halliburton
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.