Patents per Year
Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6102166 | Wheelchair brake | — | 2000-08-15 | |
| D312365 | Table | — | 1990-11-27 | |
| 4858996 | Modular seating | — | 1989-08-22 | |
| D277695 | Combined tub and shower stall | — | 1985-02-19 | |
| D274392 | Stacking chair | — | 1984-06-26 | |
| 4338990 | Panel wall systems with modular component build-up | Robert L. Knapp, Simon W. Oppenhuizen | 1982-07-13 | $109,000 |
| 4265502 | Panel wall systems with modular component build-up | Robert L. Knapp, Simon W. Oppenhuizen | 1981-05-05 | $124,000 |