Granted Patent
Utility
US 5,404,401 · App. 08/012,293
Alarm and test system for a digital added main line
Inventors:
David C. Bliven, Anthony Vranicar, Philip B. Vail, Gerald L. Shimirak, Julian S. Mullaney
Patented Case
View Patent ↗
Granted: Apr 4, 1995
Filed: Feb 1, 1993
Inventors
David C. Bliven
Anthony Vranicar
Philip B. Vail
Gerald L. Shimirak
Julian S. Mullaney
Assignee (at issue)
Raychem Limited
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.