Granted Patent
Utility
US 4,248,557 · App. 06/016,643
Railway car counter balanced tilting deck
Inventors:
David J. Roldness, Thomas H. Watson, Gary D. Wonacott
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Mar 1, 1979
Inventors
David J. Roldness
Thomas H. Watson
Gary D. Wonacott
Assignee (at issue)
The Pullman Company 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.