Granted Patent
Utility
US 4,797,239 · App. 07/036,877
Foam pig with textured surface
Inventor:
Hyun Je Cho
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Apr 9, 1987
Inventor
Hyun Je Cho
Assignee (at issue)
T.D. WILLIAMSON
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.