Granted Patent
Utility
US 4,837,565 · App. 07/084,845
Tri-state function indicator
Inventor:
Randall A. White
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Aug 13, 1987
Inventor
Randall A. White
Assignee (at issue)
Digital Equipment 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.