Granted Patent
Utility
US 5,771,285 · App. 08/597,758
Circuit and method for detecting telephone line status and telephone instrument embodying the same
Inventor:
Brian Albert Wittman
Patented Case
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Granted: Jun 23, 1998
Filed: Feb 7, 1996
Inventor
Brian Albert Wittman
Assignee (at issue)
LUCENT TECHNOLOGIES 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.