Granted Patent
Utility
US 4,662,972 · App. 06/715,919
Method of forming a non-skid surfaced structure
Inventor:
Thomas L. Thompson
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Mar 25, 1985
Inventor
Thomas L. Thompson
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.