Granted Patent
Utility
US 4,984,187 · App. 06/813,180
First order recursive digital filter without multiplier
Inventors:
Mark D. Graybill, Allan C. Goetz
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Dec 24, 1985
Inventors
Mark D. Graybill
Allan C. Goetz
Assignee (at issue)
Hughes Aircraft Company
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.