Granted Patent
Utility
US 4,298,774 · App. 06/035,139
Call waiting signal arrangement
Inventor:
Julius Jusinskas, Jr.
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: May 2, 1979
Inventor
Julius Jusinskas, Jr.
Assignee (at issue)
GTE Automatic Electric Labs 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.