Granted Patent
Utility
US 4,581,487 · App. 06/629,659
Universal DC feed for telephone line and trunk circuits
Inventor:
William T. Cochran
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jul 11, 1984
Inventor
William T. Cochran
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.