Granted Patent
Utility
US 4,752,772 · App. 07/033,358
Key-embedded Braille display system
Inventors:
Timothe Litt, William J. Warren, Dennis Williams, Eric E. Litt
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Mar 30, 1987
Inventors
Timothe Litt
William J. Warren
Dennis Williams
Eric E. Litt
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.