Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6152159 | Valve assembly and method for use in delivery of molten metal | Richard L. Schaefer | 2000-11-28 |
| 5725043 | Low pressure casting process and apparatus | Richard L. Schaefer, Carl W. D. Schaefer, James Michael Williamson | 1998-03-10 |
| 5590681 | Valve assembly | Richard L. Schaefer, Carl W. D. Schaefer, James Michael Williamson | 1997-01-07 |
| 4730701 | Stepladder assembly | John D. Vasichko, Clarence H. Bucher, Nevin L. Sindlinger | 1988-03-15 |