2220087

Information

• Patent Grant
• 2220087

• References
• Source

• Patent Number

  2,220,087

• Date Filed

  Not available

• Date Issued

  Tuesday, November 5, 1940
  85 years ago

• CPC

  • G01S3/12 - Means for determining sense of direction
  • G01S3/065 - by using non-directional aerial

• US Classifications

  • 342 - Communications: directive radio wave systems and devices