Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5216782 | Sash counterbalance leveling device | Robert Schenck, Jeffrey H. Hoffman | 1993-06-08 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5216782 | Sash counterbalance leveling device | Robert Schenck, Jeffrey H. Hoffman | 1993-06-08 |