Granted Patent
Utility
US 5,089,981 · App. 07/342,011
Hybrid form digital filter
Inventor:
Richard C. Cabot
Patented Case
View Patent ↗
Granted: Feb 18, 1992
Filed: Apr 24, 1989
Inventor
Richard C. Cabot
Assignee (at issue)
AUDIO PRECISION, 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.