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| Number | Title | Issue Date |
| 5052037 | Video telephone employing pulse width modulation for data transmission A modem implementation a high data transmission rate is implemented by means of pulse width modulation. The timing magnitude for each baud is weighted by the binary value of the data input. Minimal components are employed and the entire circuit is compris... | 09/24/1991 |
| 5018167 | Modem employing pulse width modulation for data transmission A modem implementation a high data transmission rate is implemented by means of pulse width modulation. The timing magnitude for each baud is weighted by the binary value of the data input. Minimal components are employed and the entire circuit is compris... | 05/21/1991 |
