Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4631624 | Time delay undervoltage release | Robert F. Dvorak, Henry J. Zylstra | 1986-12-23 |
| 4538194 | Ground fault desensitization circuit for electronic breaker | Henry J. Zylstra | 1985-08-27 |
| 4213165 | Circuit breaker having an electronic fault sensing and trip initiating unit | Henry J. Zylstra | 1980-07-15 |