Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4485996 | Height adjustor for furniture | Duane M. Beukema | 1984-12-04 |
| 4438898 | Chain control locking assembly | Duane M. Beukema, Kenneth W. Hozeski | 1984-03-27 |
| 4390206 | Synchrotilt chair control | Frederick S. Faiks, Charles C. Pergler, Ronald L. Whitwam, Duane M. Beukema, Kenneth W. Hozeski | 1983-06-28 |
| 4375301 | Chair seat adjustment assembly | Charles C. Pergler | 1983-03-01 |
| 4373692 | Chair control with height adjustment actuator | Duane M. Beukema, Kenneth W. Hozeski | 1983-02-15 |
| 4324382 | Height adjustable chair base | Duane M. Beukema | 1982-04-13 |
| 4214726 | Chair control | Alexander A. Karrip, Charles C. Pergler, Donald D. Korell | 1980-07-29 |