Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6644741 | Chair | Manfred Kleinikel, Werner Hartel | 2003-11-11 |
| 6533355 | Height-adjustment mechanism for a chair | Michael D. Broekhuis, Richard N. Roslund, Jr., Stephen J. Simpson | 2003-03-18 |
| 6361110 | Tilt control for chair | Richard N. Roslund, Jr., Larry A. Wilkerson, Troy Roark, Joel Dral, Steve Simpson +1 more | 2002-03-26 |
| 6176548 | Tilt mechanism for chair having adjustable spring characteristics | Douglas M. Thole | 2001-01-23 |
| 6059363 | Chairback with side torsional movement | Richard N. Roslund, Jr., Robert T. Ritt, Larry A. Wilkerson, Joel Dral, John Clark | 2000-05-09 |
| 6053579 | Height-Adjustable chair arm assembly having cam-type adjusting mechanism | Larry A. Wilkerson | 2000-04-25 |
| 6015187 | Tilt control for chair | Richard N. Roslund, Jr., Larry A. Wilkerson, Troy Roark, Joel Dral, Steve Simpson +1 more | 2000-01-18 |
| 4720071 | Split nut mechanical height adjusting mechanism for chair | Donald L. Cool | 1988-01-19 |