Granted Patent
Utility
US 6,330,757 · App. 09/135,974
Footwear with energy storing sole construction
Inventor:
Brian Russell
Patented Case
View Patent ↗
Granted: Dec 18, 2001
Filed: Aug 18, 1998
Inventor
Brian Russell
Assignee (at issue)
Britek Footwear Development, 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.