Granted Patent
Utility
US 4,334,129 · App. 06/197,911
Telephone digital office cutover system
Inventors:
Paul V. De Luca, John Gazzo, Thomas A. Hollfelder
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Oct 17, 1980
Inventors
Paul V. De Luca
John Gazzo
Thomas A. Hollfelder
Assignee (at issue)
Porta Systems 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.