Granted Patent
Utility
US 4,305,668 · App. 06/138,416
Vortexer
Inventor:
Robert A. Bilbrey
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Apr 8, 1980
Inventor
Robert A. Bilbrey
Assignee (at issue)
Scientific Manufacturing Industries, 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.