Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6099076 | Chair back construction | Duane F. Nagel, Dale M. Groendal, Jeffrey A. Hall, Edward L. Tyler | 2000-08-08 |
| 6062649 | Chair back construction | Duane F. Nagel, Dale M. Groendal, Jeffrey A. Hall, Edward L. Tyler | 2000-05-16 |
| 5755488 | Chair with adjustable seat | Gregory S. Beda, Diane Ellis, Michelle R. Johnson, Charles P. Roossien, James P. Steffens | 1998-05-26 |
| 5318346 | Chair with zero front rise control | Charles P. Roossien, David C. Pugh, Dale M. Groendal, James E. Massey, Robert Scheper +4 more | 1994-06-07 |