Hellwarth; George A.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hellwarth; George A..The latest application filed is for "automated public phone control for charge and collect billing".
- Hellwarth; George A. - Dallas TX
- Hellwarth; George A. - Deerfield Beach FL
| Patent | Date |
|---|---|
| Automated public phone control for charge and collect billing Grant 4,935,956 - Hellwarth , et al. June 19, 1 | 1990-06-19 |
| Data flow component for processor and microprocessor systems Grant 4,418,383 - Doyle , et al. November 29, 1 | 1983-11-29 |
| Analog To Digital Converter For Electrical Signals Grant 3,859,654 - Harrison , et al. January 7, 1 | 1975-01-07 |
| Time Duration Modulation And Demodulation For Storage Or Transmission Of Digital Data Grant 3,840,891 - Hellwarth October 8, 1 | 1974-10-08 |
| Switching Circuits Particularly Useful For Analog-to-digital Converters Grant 3,818,246 - Hellwarth , et al. June 18, 1 | 1974-06-18 |
| Analog-to-digital Converter Circuits Grant 3,733,600 - Hellwarth , et al. May 15, 1 | 1973-05-15 |
| Isolated Digital-to-analog Converter Grant 3,697,980 - Boinodiris , et al. October 10, 1 | 1972-10-10 |
| Binary Coded Digital To Analog Converter Grant 3,576,575 - Hellwarth , et al. April 27, 1 | 1971-04-27 |
| Digital Fsk/psk Detector Grant 3,571,712 - Hellwarth , et al. March 23, 1 | 1971-03-23 |
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