Granted Patent
Utility
US 5,213,421 · App. 07/825,026
Vacuum belt drive train and bearing therefor
Inventor:
Russell D. Ide
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Jan 24, 1992
Inventor
Russell D. Ide
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.