Granted Patent
Utility
US 5,533,224 · App. 08/421,058
Foam pig with scraper strips
Inventor:
Kenneth M. Knapp
Patented Case
View Patent ↗
Granted: Jul 9, 1996
Filed: Apr 12, 1995
Inventor
Kenneth M. Knapp
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.