Opal; Kenneth E.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Opal; Kenneth E..The latest application filed is for "method and apparatus for controlling a walking beam pump".
- Opal; Kenneth E. - Oakmont PA
| Patent | Date |
|---|---|
| Method and apparatus for controlling a walking beam pump Grant 5,204,595 - Opal , et al. April 20, 1 | 1993-04-20 |
| Method and apparatus for controlling power and optimizing power factor in an AC-to-DC converter Grant 4,293,905 - Opal October 6, 1 | 1981-10-06 |
| Method And Apparatus For Providing Efficient And Stable Power Inversion With Voltage And Frequency Control Grant 3,819,992 - Opal , et al. June 25, 1 | 1974-06-25 |
| Method And Apparatus For Pulse Width Modulation With Variable Frequency Modes Grant 3,766,497 - Opal , et al. October 16, 1 | 1973-10-16 |
| Apparatus For Center-referenced Pulse Width Modulation Grant 3,753,155 - Opal , et al. August 14, 1 | 1973-08-14 |
| Apparatus For Motor Current Minimization Grant 3,723,840 - Opal , et al. March 27, 1 | 1973-03-27 |
| Energizing System With Digital Control Circuit For Regulating Multiphase Inverter Grant 3,603,866 - Opal September 7, 1 | 1971-09-07 |
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