Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5382192 | Damper control apparatus | — | 1995-01-17 |
| 5216782 | Sash counterbalance leveling device | Robert Schenck, Joseph T. Scheurich | 1993-06-08 |
| 5018628 | Working surface | Robert Schenck, Michael Klein, Gene R. Kouba | 1991-05-28 |