Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4949771 | Steel security door frame | C. Lynwood Grisham | 1990-08-21 |
| 4888924 | Door frame extension assembly | C. Lynwood Grisham | 1989-12-26 |
| 4850144 | Door extension apparatus | C. Lynwood Grisham | 1989-07-25 |