Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6231639 | Modular filter for molten metal | Richard S. Henderson, Lennard Lutes, Harvey G. Martin | 2001-05-15 |
| 5741422 | Molten metal filter cartridge | Richard S. Henderson, Robert Franken | 1998-04-21 |
| 5028036 | Filter for molten ferrous metal | Ajit Sane, Alison W. Gee | 1991-07-02 |