Granted Patent
Utility
US 6,437,267 · App. 09/640,309
Water proof and dust proof structure of key switch device
Inventor:
Fumihito Imai
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Aug 16, 2000
Inventor
Fumihito Imai
Assignee (at issue)
NEC CORPORATION
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.