Issued Patents 2020
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10823313 | Smoke and sound barrier for a building penetration | John C. Hulteen, George W. Frost, Ernst Schmidt | 2020-11-03 |
| 10662644 | Penetration firestop system | John C. Hulteen, George W. Frost, Ernst Schmidt | 2020-05-26 |
| 10597867 | Smoke and sound barrier for a building joint system | John C. Hulteen, George W. Frost, Ernst Schmidt | 2020-03-24 |