Granted Patent
Utility
US 6,275,138 · App. 09/589,023
Variable resistor changing resistance value by pressing
Inventor:
Ryoichi Maeda
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: Jun 7, 2000
Inventor
Ryoichi Maeda
Assignee (at issue)
ALPS ELECTRIC CO., LTD.
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.