Granted Patent
Utility
US 4,836,784 · App. 06/688,583
Unit for display of information on a reading device for the blind
Inventor:
Burchart Joachim
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jan 3, 1985
Inventor
Burchart Joachim
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.