Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6072317 | Plug-in multifunction tester for AC electrical distribution system | — | 2000-06-06 |
| 6057997 | Circuit breaker responsive to repeated in-rush currents produced by a sputtering arc fault | Joseph C. Engel | 2000-05-02 |
| 5969921 | Ground fault electrical switching apparatus for coordinating tripping with a downstream ground fault switch | John A. Wafer | 1999-10-19 |
| 5969920 | Test circuit for verifying operation of an arc fault detector | — | 1999-10-19 |
| 5963405 | Low cost apparatus for detecting arcing faults and circuit breaker incorporating same | Joseph C. Engel | 1999-10-05 |
| 5940256 | Circuit breaker responsive to repeated in-rush currents produced by a sputtering arc fault | Joseph C. Engel | 1999-08-17 |
| 5818237 | Apparatus for envelope detection of low current arcs | Joseph C. Zuercher, Steven Christopher Schmalz | 1998-10-06 |
| 5815352 | Arc fault detector with limiting of sensed signal to shape response characteristic and circuit breaker incoprorating same | — | 1998-09-29 |
| 5805397 | Arcing fault detector with multiple channel sensing and circuit breaker incorporating same | — | 1998-09-08 |
| 5726577 | Apparatus for detecting and responding to series arcs in AC electrical systems | Joseph C. Engel | 1998-03-10 |
| 5691869 | Low cost apparatus for detecting arcing faults and circuit breaker incorporating same | Joseph C. Engel | 1997-11-25 |
| 5579194 | Motor starter with dual-slope integrator | Joseph C. Engel | 1996-11-26 |
| 5546266 | Circuit interrupter with cause for trip indication | John A. Wafer | 1996-08-13 |
| 5519561 | Circuit breaker using bimetal of thermal-magnetic trip to sense current | Stephen A. Mrenna, David M. Wood | 1996-05-21 |
| 5493278 | Common alarm system for a plurality of circuit interrupters | John A. Wafer | 1996-02-20 |
| 5459630 | Self testing circuit breaker ground fault and sputtering arc trip unit | John A. Wafer | 1995-10-17 |
| 5420740 | Ground fault circuit interrupter with immunity to wide band noise | Joseph C. Engel | 1995-05-30 |
| 5307230 | Circuit breaker with protection against sputtering arc faults | — | 1994-04-26 |
| 5224006 | Electronic circuit breaker with protection against sputtering arc faults and ground faults | Joseph C. Engel | 1993-06-29 |
| 5166632 | Limiter circuit with means to eliminate offset and an optional selective threshold | — | 1992-11-24 |
| 4663587 | Electronic circuit for measuring electrical energy | — | 1987-05-05 |
| 4596951 | Electronic circuit for measuring AC electrical energy | Theodore M. Heinrich | 1986-06-24 |
| 4591810 | Pulse width modulator for electronic watthour metering | Theodore M. Heinrich | 1986-05-27 |