With Acoustic Wave Modifying Structure (381/153) Patents (Class 381/FOR140)

Foreign Patent Art Collections

Including sound conducting tube (381/154) (Class 381/FOR141)
Directional (381/155) (Class 381/FOR142)
Sound intensifying or spreading element (381/156) (Class 381/FOR143)
Absorbing or attenuating element (e.g., baffle, obstruction, damping) (381/158) (Class 381/FOR145)
Enclosure or resonant cavity (381/159) (Class 381/FOR146)

There are no patents to show for this class.