Granted Patent
Utility
US 4,638,191 · App. 06/628,069
Amplitude insensitive delay line
Inventors:
Richard A. Baumgartner, John N. Dukes, George A. Fisher
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Jul 5, 1984
Inventors
Richard A. Baumgartner
John N. Dukes
George A. Fisher
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.