Granted Patent
Utility
US 4,331,989 · App. 06/149,972
Magnetic disc file having dual lock mechanism
Inventor:
Stephen Ralph Viskochil
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: May 15, 1980
Inventor
Stephen Ralph Viskochil
Assignee (at issue)
Priam 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.