Granted Patent
Utility
US 6,704,550 · App. 09/660,399
Antenna switching circuit and communication system using the same
Inventors:
Kazumasa Kohama, Daisuke Fukui
Patented Case
View Patent ↗
Granted: Mar 9, 2004
Filed: Sep 12, 2000
Inventors
Kazumasa Kohama
Daisuke Fukui
Assignee (at issue)
SONY GROUP 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.