Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6987445 | Water resistant audible signal | Joshua K. Brown, Daniel W. O'Brien | 2006-01-17 |
| 6756883 | Extra loud low frequency acoustical alarm assembly | Christopher M. Baldwin | 2004-06-29 |
| 6617967 | Piezoelectric siren driver circuit | Christopher M. Baldwin, Daniel W. O'Brien | 2003-09-09 |
| 6512450 | Extra loud low frequency acoustical alarm assembly | Christopher M. Baldwin | 2003-01-28 |
| 6414604 | Piezoelectric transducer assembly adapted for enhanced functionality | Brian S. Bush | 2002-07-02 |
| 6310540 | Multiple signal audible oscillation generator | Robert L. Leonard, Jr. | 2001-10-30 |
| 6130618 | Piezoelectric transducer assembly adapted for enhanced functionality | Brian S. Bush | 2000-10-10 |
| 5990784 | Schmitt trigger loud alarm with feedback | — | 1999-11-23 |
| 5793282 | Piezoelectric audio chime | Todd Lynn Arnold | 1998-08-11 |
| 5675311 | Frequency sweeping audio signal device | Robert L. Leonard, Jr. | 1997-10-07 |
| 5675312 | Piezoelectric warbler | — | 1997-10-07 |