Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7844067 | Universal horn speaker | Wilhelm R. Lowell, John J. Lowell, Kevin Ditch | 2010-11-30 |
| 7643647 | Lay-in tile speaker system | Wilhelm R. Lowell, Carey C. Porter, Daryl Schoolfield | 2010-01-05 |
| 7120269 | Lay-in tile speaker system | Wilhelm R. Lowell, Carey C. Porter | 2006-10-10 |
| 6950526 | Sound masking and paging system | — | 2005-09-27 |
| D467579 | Lay-in tile speaker system | Wilhelm R. Lowell, Carey C. Porter | 2002-12-24 |