| 6522755 |
Vehicular loudspeaker system |
Mark E. Warnaka, Michael J. Parrella |
2003-02-18 |
| 6435303 |
Sound absorbing structure |
— |
2002-08-20 |
| 6356641 |
Vehicular loudspeaker system |
Mark E. Warnaka, Michael J. Parrella |
2002-03-12 |
| 6218766 |
Loudspeaker assembly |
Mark E. Warnaka |
2001-04-17 |
| 6195440 |
Piezoelectric transducers |
Mark E. Warnaka |
2001-02-27 |
| 5838805 |
Piezoelectric transducers |
Mark E. Warnaka |
1998-11-17 |
| 5835608 |
Signal separating system |
Francis J. Driscoll |
1998-11-10 |
| 5511127 |
Active noise control |
— |
1996-04-23 |
| 5046103 |
Noise reducing system for voice microphones |
Lynn A. Poole |
1991-09-03 |
| 4991433 |
Phase track system for monitoring fluid material within a container |
Mark E. Warnaka |
1991-02-12 |
| 4562589 |
Active attenuation of noise in a closed structure |
John M. Zalas |
1985-12-31 |
| 4477505 |
Structure for absorbing acoustic and other wave energy |
— |
1984-10-16 |
| 4473906 |
Active acoustic attenuator |
Lynn A. Poole, Jiří Tichý |
1984-09-25 |
| 4339018 |
Sound absorbing structure |
— |
1982-07-13 |
| 4243117 |
Sound absorbing structure |
— |
1981-01-06 |