3893074

Information

• Patent Grant
• 3893074

• References
• Source

• Patent Number

  3,893,074

• Date Filed

  Not available

• Date Issued

  Tuesday, July 1, 1975
  49 years ago

• CPC

  • G08C19/14 - using combination of fixed frequencies
  • G08C23/02 - using infrasonic, sonic or ultrasonic waves

• US Classifications

  • 367 - Communications, electrical: acoustic wave systems and devices
  • 340 - Communications: electrical