Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4725045 | Slag-retaining plug for metal pouring operations | Donald K. Herald, Donald L. Herald, John W. Schwer | 1988-02-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4725045 | Slag-retaining plug for metal pouring operations | Donald K. Herald, Donald L. Herald, John W. Schwer | 1988-02-16 |