Granted Patent
Utility
US 6,540,606 · App. 09/499,340
Portable information terminal, recording medium and program
Inventor:
Tetsuya Matsukata
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Feb 7, 2000
Inventor
Tetsuya Matsukata
Assignee (at issue)
SONY COMPUTER ENTERTAINMENT 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.