Granted Patent
Utility
US 5,462,389 · App. 08/189,855
Undersea cable burial plowshare and sled apparatus
Inventor:
Frank D. Messina
Patented Case
View Patent ↗
Granted: Oct 31, 1995
Filed: Feb 1, 1994
Inventor
Frank D. Messina
Assignee (at issue)
AT & T IPM Corp.
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.