Granted Patent
Utility
US 5,254,147 · App. 07/978,445
Draw-down cyclonic vaccum cleaner
Inventor:
Eugene W. Finke
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Nov 18, 1992
Inventor
Eugene W. Finke
Assignee (at issue)
NuTone 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.