Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831778 | Upper window sash with projections for simplified sash installation and removal | David Johnson, J. Carson Jackson | 1989-05-23 |
| 4827685 | Insulator for rail interlock at upper/lower window sash interface | — | 1989-05-09 |
| D300255 | Frame member for windows | — | 1989-03-14 |
| D300256 | Frame member for windows | — | 1989-03-14 |