Granted Patent
Utility
US 4,538,027 · App. 06/402,426
System for inputting a security code to a computer
Inventor:
Craig E. Deyer
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Jul 28, 1982
Inventor
Craig E. Deyer
Assignee (at issue)
RCA 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.