Granted Patent
Utility
US 4,447,828 · App. 06/352,356
Phase change dynamic scrambling
Inventor:
Pieter den Toonder
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Feb 25, 1982
Inventor
Pieter den Toonder
Assignee (at issue)
Oak Industries Inc.
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.