Granted Patent
Utility
US 6,099,091 · App. 09/009,575
Traction enhanced wheel apparatus
Inventor:
Sanford F. Campbell
Patented Case
View Patent ↗
Granted: Aug 8, 2000
Filed: Jan 20, 1998
Inventor
Sanford F. Campbell
Assignee (at issue)
Letro Products, 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.