Granted Patent
Utility
US 6,125,273 · App. 09/057,391
Apparatus and method for operating a cellular or portable telephone
Inventor:
Harumi Yamagishi
Patented Case
View Patent ↗
Granted: Sep 26, 2000
Filed: Apr 8, 1998
Inventor
Harumi Yamagishi
Assignees (at issue)
SONY GROUP CORPORATION
SONY ELECTRONICS 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.