2241031

Information

• Patent Grant
• 2241031

• References
• Source

• Patent Number

  2,241,031

• Date Filed

  Not available

• Date Issued

  Tuesday, May 6, 1941
  84 years ago

• CPC

  • H04Q3/48 - using markers

• US Classifications

  • 379 - Telephonic communications
  • 382 - Image analysis