Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11512524 | Fire-rated elevator door frame and transom flush with door | Mark Gabriel Hamilton, William Theodore Sillman, Leo Joseph Tomperi | 2022-11-29 |
| 10683697 | Fire-rated sliding glass elevator door | Julie Ann Clauson, Mark Gabriel Hamilton, Chad Joseph Norberg, William Theodore Sillman, Leo Joseph Tomperi | 2020-06-16 |