Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4727582 | Hearing aid with adjustable flexible connection member | Robert de Vries, Johannes P. M. Damen | 1988-02-23 |
RV
Roelof A. Venema
Overall (All Time): #3,947,312 of 4,157,543Top 95%
1
Patents All Time