Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5026581 | Invisible mullion assembly | A. Risher Hall | 1991-06-25 |
| 4691489 | Joint seal assembly | — | 1987-09-08 |
| 4608796 | Multiple pane glass unit | — | 1986-09-02 |
| 4464874 | Window unit | A. Risher Hall, Robert C. Hordis | 1984-08-14 |