Granted Patent
Utility
US 5,375,730 · App. 08/023,319
Unloading valve for hopper car
Inventors:
Andrew J. Bahr, Luigi P. Simonelli, Wallace G. Murray
Patented Case
View Patent ↗
Granted: Dec 27, 1994
Filed: Feb 26, 1993
Inventors
Andrew J. Bahr
Luigi P. Simonelli
Wallace G. Murray
Assignee (at issue)
Columbian Chemicals 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.