Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D277525 | Chair | Randall P. Buhk, Alex Karrip | 1985-02-12 |
| 4438898 | Chain control locking assembly | Jack R. Knoblauch, Duane M. Beukema | 1984-03-27 |
| 4390206 | Synchrotilt chair control | Frederick S. Faiks, Charles C. Pergler, Ronald L. Whitwam, Jack R. Knoblauch, Duane M. Beukema | 1983-06-28 |
| D267989 | Chair | Randall P. Buhk, Alex Karrip | 1983-02-22 |
| D267990 | Chair | Randall P. Buhk, Alex Karrip | 1983-02-22 |
| 4373692 | Chair control with height adjustment actuator | Jack R. Knoblauch, Duane M. Beukema | 1983-02-15 |
| D267838 | Chair | Randall P. Buhk, Alex Karrip | 1983-02-08 |
| 4262871 | Plastic encapsulated base | Stephen B. Kolk | 1981-04-21 |