Granted Patent
Utility
US 4,577,255 · App. 06/622,432
Lightning protection circuit for digital subscriber loop interface
Inventor:
Philip T. Martin
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Jun 20, 1984
Inventor
Philip T. Martin
Assignee (at issue)
ITT 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.