Granted Patent
Utility
US 4,369,540 · App. 06/248,298
Floor cleaning machine
Inventors:
Jack L. Burgoon, David J. Karpanty
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Mar 27, 1981
Inventors
Jack L. Burgoon
David J. Karpanty
Assignee (at issue)
The Scott Fetzer 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.