Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10422183 | Ladder | Rory Frick | 2019-09-24 |
| 5979053 | Method of assembling a butterfly damper capable of fully stopping the flow of air and/or gases | J. Michael Schaeffer, Edgar H. Nelson | 1999-11-09 |
| 5876015 | Butterfly damper | J. Michael Schaeffer, Edgar H. Nelson | 1999-03-02 |