3676780

Information

• Patent Grant
• 3676780

• References
• Source

• Patent Number

  3,676,780

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1972
  52 years ago

• CPC

  • G08C19/14 - using combination of fixed frequencies

• US Classifications

  • 341 - Coded data generation or conversion
  • 340 - Communications: electrical
  • 367 - Communications, electrical: acoustic wave systems and devices
  • 455 - Telecommunications