Granted Patent
Utility
US 4,438,921 · App. 06/271,675
Calibration of load indicator for ergometric exerciser
Inventor:
Eugene J. Szymski
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Jun 8, 1981
Inventor
Eugene J. Szymski
Assignee (at issue)
Schwinn Bicycle 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.