Granted Patent
Utility
US 6,236,867 · App. 09/181,546
Portable wireless device
Inventors:
Akira Todo, Hiroya Usui
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Oct 29, 1998
Inventors
Akira Todo
Hiroya Usui
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.