3634855

Information

• Patent Grant
• 3634855

• References
• Source

• Patent Number

  3,634,855

• Date Filed

  Not available

• Date Issued

  Tuesday, January 11, 1972
  53 years ago

• CPC

  • H04L27/26 - Systems using multi-frequency codes
  • G11B20/1488 - characterised by the use of three levels

• US Classifications

  • 341 - Coded data generation or conversion
  • 375 - Pulse or digital communications
  • G9B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER