Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881027 | Circuit arrangement comprising input circuits to find a power output sum for application in multi-phase electricity meters | Franz Renggli | 1989-11-14 |
| 4864223 | Measuring transformer to measure the current flowing in an electric conductor | Mathis Halder, Thomas Seitz | 1989-09-05 |
| 4853620 | Circuit arrangement comprising multiplier circuits to find the sum of electrical power outputs for application in multi-phase electricity meters | Mathis Halder | 1989-08-01 |