Granted Patent
Utility
US 4,315,106 · App. 06/098,104
Apparatus for regulating current supplied to a telephone line signal of the type employed in digital telephone systems
Inventor:
Ramon C. W. Chea, Jr.
Patented Case
View Patent ↗
Granted: Feb 9, 1982
Filed: Nov 28, 1979
Inventor
Ramon C. W. Chea, Jr.
Assignee (at issue)
International Telephone and Telegraph 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.