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| Number | Title | Issue Date |
| 4724435 | Bi-directional data telemetry system The data telemetry system disclosed is a complete data communications systems suitable for use by utilities such as electric companies, gas companies and water companies which can be used for meter reading and load management at individual subscribers pre... | 02/09/1988 |
| 4677686 | Passive transmission of data over cable TV systems A communications system which enables enhanced services to be provided over cable TV systems. The design of the system is such that amplification is not required. Therefore, two-way transmission is possible on the low band of "two-way capable" cable syste... | 06/30/1987 |
| 4672605 | Data and voice communications system A high speed and relatively error free communications system is disclosed which enables the high speed transmission of data at a 19.2 kilobit per second rate. The data is transmitted over the same communications medium as voice transmissions, the data tra... | 06/09/1987 |
| 4433212 | Telephone line interface circuit A circuit for coupling digital or analog data signals to a telephone line. A direct coupled transistorized circuit is disclosed having three different impedance conditions: on-hook, off-hook, and loop-test. Consequently, data can be transmitted regardless... | 02/21/1984 |
| 4425661 | Data under voice communications system A communications system capable of simultaneously transmitting voice and data information. The spectral energy of the data signal is smeared by spreading it in a spectrum with energy packed in the lower frequency range under the conventional voice signal ... | 01/10/1984 |
| 4425642 | Simultaneous transmission of two information signals within a band-limited communications channel A co-channel communications system is disclosed which permits a digital data signal to be simultaneously transmitted with a communications medium signal such as telephone voice or television video. The data signal or signals are converted into very low mu... | 01/10/1984 |
