Granted Patent
Utility
US 6,551,220 · App. 09/396,803
Exercise resistance device with magnets
Inventor:
Duane G. Schroeder
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Sep 14, 1999
Inventor
Duane G. Schroeder
Assignee (at issue)
KURT MANUFACTURING COMPANY, INC.
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.