Granted Patent
Utility
US 6,414,720 · App. 09/599,552
Digital broadcasting system using virtual channels
Inventors:
Ryota Tsukidate, Kenichi Fujita, Shigeki Kaneko, Yoshiyasu Takeuchi
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Jun 23, 2000
Inventors
Ryota Tsukidate
Kenichi Fujita
Shigeki Kaneko
Yoshiyasu Takeuchi
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.