Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6467500 | Ball valve locking device | — | 2002-10-22 |
| 5603194 | Apparatus for retrofitting an existing door to provide a fire rating to the unrated existing door | George Perlin | 1997-02-18 |