1707617

Information

• Patent Grant
• 1707617

• References
• Source

• Patent Number

  1,707,617

• Date Filed

  Not available

• Date Issued

  Tuesday, April 2, 1929
  95 years ago

• CPC

  • H04R9/025 - Magnetic circuit
  • H04R1/24 - Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
  • H04R1/345 - for loudspeakers
  • H04R7/122 - comprising a plurality of sections or layers
  • H04R7/14 - corrugated, pleated or ribbed
  • H04R7/20 - Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
  • H04R9/02 - Details
  • H04R9/042 - by pressurised air
  • H04R9/045 - Mounting
  • H04R9/063 - using a plurality of acoustic drivers
  • H04R11/02 - Loudspeakers

• US Classifications

  • 381 - Electrical audio signal processing systems and devices