Granted Patent
Utility
US 4,890,646 · App. 07/338,862
Flexible siphon pipe for tank car
Inventor:
Paul J. Dumser
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Apr 17, 1989
Inventor
Paul J. Dumser
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.