Granted Patent
Utility
US 4,143,397 · App. 05/778,594
Comb filter apparatus
Inventor:
David D. Holmes
Patented Case
View Patent ↗
Granted: Mar 6, 1979
Filed: Mar 17, 1977
Inventor
David D. Holmes
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.