2159481

Information

• Patent Grant
• 2159481

• References
• Source

• Patent Number

  2,159,481

• Date Filed

  Not available

• Date Issued

  Tuesday, May 23, 1939
  85 years ago

• CPC

  • G01S3/86 - with means for eliminating undesired waves
  • G01S3/8036 - derived directly from separate directional systems

• US Classifications

  • 181 - Acoustics