Granted Patent
Utility
US 5,411,331 · App. 08/069,488
Device for promoting gravity flow of non-free-flowing solids
Inventor:
Rodney L. Griffin
Patented Case
View Patent ↗
Granted: May 2, 1995
Filed: Jun 1, 1993
Inventor
Rodney L. Griffin
Assignee (at issue)
Westinghouse Electric 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.