Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5411393 | Premix burner for furnace with gas enrichment | John D. Butler | 1995-05-02 |
| 5209893 | Adjustable burner insert and method of adjusting same | John D. Butler | 1993-05-11 |
| 5196155 | Removable filter sieve for combustion piping | John D. Butler | 1993-03-23 |