Granted Patent
Utility
US 4,598,646 · App. 06/693,186
High volume covered hopper car
Inventors:
Richard H. Dugge, Donald E. Gruner
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: Jan 22, 1985
Inventors
Richard H. Dugge
Donald E. Gruner
Assignee (at issue)
ACF Industries Incorporated
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.