Granted Patent
Utility
US 6,690,925 · App. 09/283,970
Portable telephone capable of increasing facility of operation
Inventor:
Shigeo Yoshihara
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Apr 2, 1999
Inventor
Shigeo Yoshihara
Assignee (at issue)
NEC 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.