Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4949771 | Steel security door frame | Fred A. Grisham | 1990-08-21 |
| 4888924 | Door frame extension assembly | Fred A. Grisham | 1989-12-26 |
| 4850144 | Door extension apparatus | Fred A. Grisham | 1989-07-25 |
| 4438961 | Door latch means | Freddie A. Grisham | 1984-03-27 |