Granted Patent
Utility
US 4,435,803 · App. 06/322,606
Analog subscriber/trunk module with shared ringing source and ring-trip
Inventors:
Santanu Das, Ramon C. W. Chea, Jr., Russ C. Casterline
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Nov 18, 1981
Inventors
Santanu Das
Ramon C. W. Chea, Jr.
Russ C. Casterline
Assignee (at issue)
International Telephone and Telegraph 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.