Granted Patent
Utility
US 4,921,090 · App. 07/289,507
Vibratory conveyor
Inventor:
Vaughn Gregor
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Dec 22, 1988
Inventor
Vaughn Gregor
Assignee (at issue)
FMC CORPORATION
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.