Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4779669 | Feeder sleeves | Helmut Schopp | 1988-10-25 |
| 4694884 | Molten metal casting and feeder sleeves for use therein | David R. Butler | 1987-09-22 |
| 4203542 | Calculating apparatus | — | 1980-05-20 |