Granted Patent
Utility
US 5,013,530 · App. 07/462,232
Sparger system for discharge of bulk material from hopper cars
Inventor:
Colin R. McGregor
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Jan 9, 1990
Inventor
Colin R. McGregor
Assignee (at issue)
Tenneco Canada Inc.
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.