Granted Patent
Utility
US 4,751,607 · App. 06/895,224
Communication line transient protection
Inventor:
Douglas C. Smith
Patented Case
View Patent ↗
Granted: Jun 14, 1988
Filed: Aug 11, 1986
Inventor
Douglas C. Smith
Assignees (at issue)
American Telephone and Telegraph, Co.
AT&T Information Systems 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.