Granted Patent
Utility
US 4,588,921 · App. 06/672,154
Vacuum-fluorescent display matrix and method of operating same
Inventor:
Kurt M. Tischer
Patented Case
View Patent ↗
Granted: May 13, 1986
Filed: Nov 16, 1984
Inventor
Kurt M. Tischer
Assignee (at issue)
International Standard Electric 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.