Granted Patent
Utility
US 5,215,187 · App. 07/830,173
Keyboard membrane keyswitch assembly
Inventors:
Liao Ping-Chieng, Hsu Chien-Shih
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jan 31, 1992
Inventors
Liao Ping-Chieng
Hsu Chien-Shih
Assignee (at issue)
Acer Incorporated
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.