Granted Patent
Utility
US 5,203,448 · App. 07/832,929
Push button key switch
Inventors:
Masamitsu Osada, Nobuyuki Takahashi
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Feb 11, 1992
Inventors
Masamitsu Osada
Nobuyuki Takahashi
Assignee (at issue)
Minebea 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.