Granted Patent
Utility
US 4,374,587 · App. 06/226,766
Exercise treadmill
Inventor:
Ralph Ogden
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: Jan 21, 1981
Inventor
Ralph Ogden
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.