Granted Patent
Utility
US 6,185,296 · App. 08/979,770
Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal
Inventor:
Masashi Saitoh
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Nov 26, 1997
Inventor
Masashi Saitoh
Assignee (at issue)
NEC CORPORATION
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.