3809138

Information

• Patent Grant
• 3809138

• References
• Source

• Patent Number

  3,809,138

• Date Filed

  Not available

• Date Issued

  Tuesday, May 7, 1974
  51 years ago

• CPC

  • G11B3/54 - Storing manipulating

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 150 - Purses, wallets, and protective covers
  • 206 - Special receptacle or package
  • 383 - Flexible bags
  • G9B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER