Granted Patent
Utility
US 4,293,738 · App. 06/092,877
Analog access arrangement for a digital telephone office
Inventors:
David J. Stelte, Alex W. Kobylar
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Nov 9, 1979
Inventors
David J. Stelte
Alex W. Kobylar
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.