Granted Patent
Utility
US 5,199,556 · App. 07/772,789
Structure of key switch
Inventor:
Michael Lee
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Oct 8, 1991
Inventor
Michael Lee
Assignee (at issue)
Silitek 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.