Granted Patent
Utility
US 4,879,771 · App. 07/161,800
Floor clean-out assembly
Inventor:
James Piskula
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Feb 29, 1988
Inventor
James Piskula
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.