Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6829544 | Line current differential protective relaying method and relay for in-zone tapped transformers | Bogdan Z. Kasztenny | 2004-12-07 |
| 6469629 | Distributed logic in multiple protective relays | Roger P. Moore, Andrew Baigent | 2002-10-22 |
| 5517573 | Ported loudspeaker system and method with reduced air turbulence | Matthew Polk | 1996-05-14 |
| 4759066 | Sound system with isolation of dimensional sub-speakers | Matthew Polk | 1988-07-19 |
| 4638505 | Optimized low frequency response of loudspeaker systems having main and sub-speakers | Matthew Polk | 1987-01-20 |
| 4630298 | Method and apparatus for reproducing sound having a realistic ambient field and acoustic image | Matthew Polk | 1986-12-16 |