Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4797932 | Speaker volume control apparatus and method | John B. Keys | 1989-01-10 |
| 4694725 | Sound generating system for a keyboard | Daniel B. Seevers | 1987-09-22 |
JR
John J. Rohulich
Overall (All Time): #2,327,851 of 4,157,543Top 60%
2
Patents All Time