Granted Patent
Utility
US 5,289,830 · App. 07/810,671
Raised ridge knee pad
Inventor:
Norman D. Levine
Patented Case
View Patent ↗
Granted: Mar 1, 1994
Filed: Dec 19, 1991
Inventor
Norman D. Levine
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.