Granted Patent
Utility
US 4,540,858 · App. 06/523,084
Modular switch unit with snap-in base, separate modular switch unit and cover coded switch actuating interior lugs
Inventor:
Franz-Josef Knoop
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Aug 15, 1983
Inventor
Franz-Josef Knoop
Assignee (at issue)
Nixdorf Computer AG
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.