Granted Patent
Utility
US 6,763,231 · App. 10/182,666
Radio communication device, parent communication device, parent-child communication device and radio communication system
Inventors:
Sunao Takatori, Hisanori Kiyomatsu
Patented Case
View Patent ↗
Granted: Jul 13, 2004
Filed: Jul 31, 2002
Inventors
Sunao Takatori
Hisanori Kiyomatsu
Assignee (at issue)
Yozan Inc.
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.