Granted Patent
Utility
US 4,969,040 · App. 07/427,744
Apparatus and method for differential sub-band coding of video signals
Inventor:
Hamid Gharavi
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Oct 26, 1989
Inventor
Hamid Gharavi
Assignee (at issue)
Bell Communications Research, 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.