Granted Patent
Utility
US 6,810,025 · App. 09/729,098
DTMF transmission structure of W-CDMA WLL system
Inventor:
Woo Sung Chung
Patented Case
View Patent ↗
Granted: Oct 26, 2004
Filed: Dec 5, 2000
Inventor
Woo Sung Chung
Assignee (at issue)
LG 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.