Granted Patent
Utility
US 6,322,481 · App. 09/290,144
Adjustable weight exercise methods and apparatus
Inventor:
Mark A. Krull
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: Apr 13, 1999
Inventor
Mark A. Krull
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.