Granted Patent
Utility
US 4,631,521 · App. 06/687,629
Method and apparatus for differential run-length coding
Inventor:
Ahmed M. El-Sherbini
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Dec 31, 1984
Inventor
Ahmed M. El-Sherbini
Assignee (at issue)
Wang Laboratories, 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.