Granted Patent
Utility
US 4,255,758 · App. 06/093,221
Self-adjusting bell filter circuit for use in SECAM coders
Inventor:
Felix Aschwanden
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Nov 13, 1979
Inventor
Felix Aschwanden
Assignee (at issue)
RCA 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.