Granted Patent
Utility
US 4,674,119 · App. 06/598,650
Wide-band high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry
Inventor:
Ramon C. W. Chea, Jr.
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Apr 10, 1984
Inventor
Ramon C. W. Chea, Jr.
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.