Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711160 | Two-piece foundation ventilator | Erik H. Witten | 1987-12-08 |
| 4587892 | Foundation ventilator | Erik H. Witten | 1986-05-13 |
| 4274330 | Ventilator and mounting frame assembly | Howard W. Green | 1981-06-23 |