Granted Patent
Utility
US 6,378,446 · App. 09/752,012
Counterbalance apparatus
Inventor:
Dennis L. Long
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Dec 29, 2000
Inventor
Dennis L. Long
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.