Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5944861 | Process and apparatus for making expanded slag | David T. Horvat | 1999-08-31 |
| 4995894 | Enclosures for slag pelletization apparatus and method of operation | Kenneth W. Spencer, David T. Horvat | 1991-02-26 |
| 4451221 | Apparatus for the pelletization of heat-liquifiable solid materials | Michael Orlander, Robert P. Cotsworth | 1984-05-29 |
| 4414016 | Apparatus for the pelletization of heat-liquifiable solid materials | Michael Orlander, Robert P. Cotsworth | 1983-11-08 |