Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885451 | Automatic stepper for resistance welding | David W. Schulz | 1989-12-05 |
| 4851635 | Method and apparatus for determining the power factor of a circuit | — | 1989-07-25 |
| 4831229 | High frequency resistance spot welding structure and method | — | 1989-05-16 |
| 4804819 | Structure and method for resistance welding with an inductively coupled power source | — | 1989-02-14 |