Granted Patent
Utility
US 4,132,877 · App. 05/780,723
Removable keyboard switch
Inventor:
Phillip R. Daigle
Patented Case
View Patent ↗
Granted: Jan 2, 1979
Filed: Mar 24, 1977
Inventor
Phillip R. Daigle
Assignee (at issue)
Litton Business Systems, Inc.
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.