2539488

Information

• Patent Grant
• 2539488

• References
• Source

• Patent Number

  2,539,488

• Date Filed

  Not available

• Date Issued

  Tuesday, January 30, 1951
  74 years ago

• CPC

  • H04R21/021 - with granular resistance material
  • G01S1/72 - using ultrasonic, sonic or infrasonic waves
  • H04R7/12 - Non-planar diaphragms or cones
  • H04R7/16 - Mounting or tensioning of diaphragms or cones
  • H04R9/06 - Loudspeakers

• US Classifications

  • 381 - Electrical audio signal processing systems and devices