Granted Patent
Utility
US 4,392,223 · App. 06/219,464
Dual rail time and control unit for a T-S-T-digital switching system
Inventors:
Nathaniel Simmons, Stig E. Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Dec 23, 1980
Inventors
Nathaniel Simmons
Stig E. Magnusson
Sergio E. Puccini
Donald W. McLaughlin
David J. Stelte
Assignee (at issue)
GTE Automatic Electric Laboratories, Incorporated
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.