Granted Patent
Utility
US 5,051,981 · App. 07/471,700
Digital filtering
Inventor:
Richard B. Kline
Patented Case
View Patent ↗
Granted: Sep 24, 1991
Filed: Jan 29, 1990
Inventor
Richard B. Kline
Assignee (at issue)
Codex 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.