1
Rodney L Larson: Communication over power lines. Datran Systems Corporation, Schwegman Lundberg & Woessner, September 19, 1995: US05452344 (202 worldwide citation)

The present invention describes an FSK carrier communication systems for transmitting and receiving data on a electric utility line even in the presence of extreme noise. The present invention uses a unique FSK transmit and receive protocol to distinguish between noise and actual data. By careful se ...


2
Rodney L Larson, Donald L Meyer: Utility monitor communications systems. Datran Systems Corporation, Schwegman Lundberg and Woessner, January 10, 1995: US05381462 (109 worldwide citation)

A utility meter reading and communications system gathers data from utility meters and sends that data to a utility company's central data collection point (host computer) via phone lines. The system places a call on the user's telephone line at a specified time and date and transmits data using dua ...