Granted Patent
Utility
US 4,369,499 · App. 06/188,548
Linear phase digital filter
Inventor:
William D. Northam
Patented Case
View Patent ↗
Granted: Jan 18, 1983
Filed: Sep 18, 1980
Inventor
William D. Northam
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.