Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4786778 | Electrical discharge machining fine finish circuit with symmetrical waveform in both polarities | Kuang-Ta Ho | 1988-11-22 |
| 4471198 | Cut-off protection system for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1984-09-11 |
| 4460815 | Current limit system and method for electrical discharge machining apparatus | Oliver A. Bell, Jr. | 1984-07-17 |
| 4320278 | Servo feed system for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1982-03-16 |
| 4320279 | Programmable pulse generator for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1982-03-16 |
| 4319114 | Current limit system for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1982-03-09 |
| 4306135 | Power output module for electrical discharge machining power supply circuit | Oliver A. Bell, Jr., Davey J. Chance | 1981-12-15 |
| 4303957 | Gap condition sensing circuit for electrical discharge machining power supply | Oliver A. Bell, Jr., Davey J. Chance | 1981-12-01 |
| 4296302 | Adaptive control of gap voltage and power to control servo operation of an electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1981-10-20 |
| 4292490 | Electrical discharge machining power supply with digitally controlled on and off time and protective system | Oliver A. Bell, Jr., Davey J. Chance | 1981-09-29 |
| 4267422 | Power supply circuit of the high voltage type for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1981-05-12 |
| 4267423 | Protection circuit for electrical discharge machining power supply | Oliver A. Bell, Jr., Davey J. Chance | 1981-05-12 |
| 4258243 | Over current protection system for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1981-03-24 |
| 4254320 | Power output module for electrical discharge machining power supply circuit | Oliver A. Bell, Jr., Davey J. Chance | 1981-03-03 |
| 4249059 | Gap condition light indicator system for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1981-02-03 |
| 4242560 | Servo feed system for an electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1980-12-30 |
| 4238660 | Multi-lead servo feed system for electrical discharge machining apparatus | Oliver A. Bell, Jr., Davey J. Chance | 1980-12-09 |