Resources Contact Us Home
Browse by Category: Main > Electrical & Energy
Class Information
Number: 381/
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic

Sub-classes under this class:

Class Number Class Name Patents
381/28 Amplifier 141
381/2 Broadcast or multiplex stereo 308
381/27 Center channel 156
381/23.1 Hearing aid 145
381/17 Pseudo stereophonic 792
381/19 Quadrasonic 202
381/26 Stereo sound pickup device (microphone) 161
381/300 Stereo speaker arrangement 299

Patents under this class:

Patent Number Title Of Patent Date Issued

  Recently Added Patents
Communication terminal device, and recording medium
Motion blur reduction for LCD video/graphics processors
Solar energy converter with improved photovoltaic efficiency, frequency conversion and thermal management permitting super highly concentrated collection
Converter and measuring apparatus
Electric connection box
Nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and its methods of preparation
Porous polymeric resins
  Randomly Featured Patents
Method and subsystem for processing signals utilizing a plurality of vibrating micromechanical devices
Heel shoe construction
Method and apparatus for varying ink flow in a printing machine inking mechanism by differential adjustment of an ink metering device at individual locations along its length
Image compressing apparatus and image reading apparatus including the same, image processing apparatus including image compressing apparatus and image forming apparatus including the same, ima
Rotary cam operated positioning apparatus
Reinforced thermoplastic film sheet
Unitary installation of engine cylinder liner, piston and rod
Rotary hydrostatic machines or transmissions
Hair spray face shield
Method for improving the mechanical strength of cement matrices, and cement matrices produced thereby