Granted Patent
Utility
US 4,477,107 · App. 06/325,214
Rotating joint with separated bearings and seals
Inventors:
George R. Ferguson, William Royer
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Nov 27, 1981
Inventors
George R. Ferguson
William Royer
Assignee (at issue)
Duff-Norton Company
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.