Granted Patent
Utility
US 4,177,871 · App. 05/860,696
Toy stethoscope
Inventor:
W. Porter Clanton
Patented Case
View Patent ↗
Granted: Dec 11, 1979
Filed: Dec 15, 1977
Inventor
W. Porter Clanton
Assignee (at issue)
The Quaker Oats Company
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.