Granted Patent
Utility
US 4,449,217 · App. 06/233,816
PCM Communication system and method of operation
Inventor:
Joachim Simon
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Feb 12, 1981
Inventor
Joachim Simon
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.