Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8486263 | Filter with expandable end cap facilitating easier change-out | Daniel E. Argue, Edward M. Doyle | 2013-07-16 |
| 7670488 | Economical filter changing apparatus and method for electrical discharge machines and other applications | Edward M. Doyle, Daniel E. Argue | 2010-03-02 |
| 6881330 | Multi-stage EDM filter | Edward M. Doyle | 2005-04-19 |