Granted Patent
Utility
US 6,549,546 · App. 09/223,732
Call cut-off detection circuit for switch and method of the same
Inventor:
Dong-Won Park
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Dec 31, 1998
Inventor
Dong-Won Park
Assignee (at issue)
LF Information & Communications, 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.