Granted Patent
Utility
US 4,353,944 · App. 06/146,543
Shoe scraper mat
Inventor:
Hiroyuki Tarui
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: May 2, 1980
Inventor
Hiroyuki Tarui
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.