Granted Patent
Utility
US 5,144,569 · App. 07/548,124
Method for filtering digitized signals employing all-pass filters
Inventor:
Ingo Kunold
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Jul 5, 1990
Inventor
Ingo Kunold
Assignee (at issue)
Nixdorf Computer AG
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.