Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5979053 | Method of assembling a butterfly damper capable of fully stopping the flow of air and/or gases | J. Michael Schaeffer, Kirk Nelson | 1999-11-09 |
| 5876015 | Butterfly damper | J. Michael Schaeffer, Kirk Nelson | 1999-03-02 |