Granted Patent
Utility
US 5,239,279 · App. 07/861,079
Ceramic duplex filter
Inventors:
Aimo Turunen, Pauli Nappa
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Mar 31, 1992
Inventors
Aimo Turunen
Pauli Nappa
Assignee (at issue)
LK Products Oy
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.