Granted Patent
Utility
US 4,425,474 · App. 06/315,376
Pulp-insulated conductor cable
Inventors:
Helmut Durr, Charles B. Heard, Jr.
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: Oct 27, 1981
Inventors
Helmut Durr
Charles B. Heard, Jr.
Assignee (at issue)
Western Electric Company, 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.