Inventor
BEUKEMA DUANE M
US6 patents
Patents
6 patentsUS4776633AOct 11, 1988
Integrated chair and control
STEELCASE INC166 citations98
US4390206AJun 28, 1983
Synchrotilt chair control
STEELCASE INC98 citations96
US4438898AMar 27, 1984
Chain control locking assembly
STEELCASE INC53 citations94
US4373692AFeb 15, 1983
Chair control with height adjustment actuator
STEELCASE INC60 citations94
US4485996ADec 4, 1984
Height adjustor for furniture
STEELCASE INC27 citations91
US4324382AApr 13, 1982
Height adjustable chair base
STEELCASE INC16 citations72