Granted Patent
Utility
US 6,687,344 · App. 09/949,342
Parallel handset on-hook/off-hook detection by software-based signal power measurement
Inventors:
Chien-Cheng Tung, Xiaohua Luo, Anthony L. Mazzarini
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Sep 7, 2001
Inventors
Chien-Cheng Tung
Xiaohua Luo
Anthony L. Mazzarini
Assignee (at issue)
PCTEL,Inx.
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.