Granted Patent
Utility
US 5,573,015 · App. 08/412,283
Extruded ear plug
Inventor:
Colin D. Williams
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Mar 28, 1995
Inventor
Colin D. Williams
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.