Granted Patent
Utility
US 4,668,478 · App. 06/627,130
Vertically positioned transfer system for controlling and initiating the flow of metered amounts of solid materials
Inventors:
John C. Homer, Gilbert Lutz
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Jul 2, 1984
Inventors
John C. Homer
Gilbert Lutz
Assignee (at issue)
Federal Signal 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.