Granted Patent
Utility
US 4,214,337 · App. 06/039,313
Floor polisher
Inventors:
Wilfred C. Nise, Bertel S. Nelson
Patented Case
View Patent ↗
Granted: Jul 29, 1980
Filed: May 16, 1979
Inventors
Wilfred C. Nise
Bertel S. Nelson
Assignee (at issue)
Clarke-Gravely 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.