Granted Patent
Utility
US 5,204,643 · App. 07/817,777
Controllable high-frequency attenuator
Inventor:
Jouni I. Verronen
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Jan 8, 1992
Inventor
Jouni I. Verronen
Assignee (at issue)
Nokia Mobile Phones Ltd.
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.