Patent classifications
H
ELECTRICITY
Load children
H04
ELECTRIC COMMUNICATION TECHNIQUE
Load children
H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
Load children
1/00
Details of transducers,; loudspeakers or microphones
Load children Filter patents View analytics View as hierarchy
H04R1/20
Arrangements for obtaining desired frequency or directional characteristics
Load children Filter patents View analytics View as hierarchy
H04R1/22
for obtaining desired frequency characteristic only
Load children Filter patents View analytics View as hierarchy
H04R1/24
Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
Load children Filter patents View analytics View as hierarchy