Granted Patent
Utility
US 4,601,029 · App. 06/653,754
Communication switching system
Inventors:
Franklin Hargrave, Francisco A. Middleton
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Sep 21, 1984
Inventors
Franklin Hargrave
Francisco A. Middleton
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.