Granted Patent
Utility
US 4,606,021 · App. 06/641,625
Digital conference circuit
Inventor:
Walter K. Wurst
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Aug 17, 1984
Inventor
Walter K. Wurst
Assignee (at issue)
ITT 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.