3618013

Information

• Patent Grant
• 3618013

• References
• Source

• Patent Number

  3,618,013

• Date Filed

  Not available

• Date Issued

  Tuesday, November 2, 1971
  53 years ago

• CPC

  • G01S3/8038 - derived from different combinations of signals from separate transducers comparing sum with difference
  • B06B1/0633 - Cylindrical array
  • H04R17/08 - signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

• US Classifications

  • 367 - Communications, electrical: acoustic wave systems and devices