3135349

Information

• Patent Grant
• 3135349

• References
• Source

• Patent Number

  3,135,349

• Date Filed

  Not available

• Date Issued

  Tuesday, June 2, 1964
  60 years ago

• CPC

  • H04R1/36 - by using a single aperture of dimensions not greater than the shortest operating wavelength
  • H04R1/288 - for loudspeaker transducers
  • H04R1/2896 - for loudspeaker transducers

• US Classifications

  • 381 - Electrical audio signal processing systems and devices
  • 181 - Acoustics
  • 379 - Telephonic communications