Granted Patent
Utility
US 6,663,673 · App. 10/137,933
Prosthetic foot with energy transfer medium including variable viscosity fluid
Inventor:
Roland J. Christensen
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: May 3, 2002
Inventor
Roland J. Christensen
Assignee (at issue)
Roland J. Christensen
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.