Granted Patent
Utility
US 6,064,020 · App. 09/317,969
Key switch structure
Inventors:
Shigeru Yamada, Toshimi Chiba
Patented Case
View Patent ↗
Granted: May 16, 2000
Filed: May 25, 1999
Inventors
Shigeru Yamada
Toshimi Chiba
Assignee (at issue)
OKI ELECTRIC INDUSTRY 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.