3438693

Information

• Patent Grant
• 3438693

• References
• Source

• Patent Number

  3,438,693

• Date Filed

  Not available

• Date Issued

  Tuesday, April 15, 1969
  55 years ago

• CPC

  • G01V1/364 - Seismic filtering
  • G02B27/46 - Systems using spatial filters
  • G06E3/001 - Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements
  • G01V2210/27 - Other pre-filtering

• US Classifications

  • 359 - Optical: systems and elements
  • 356 - Optics: measuring and testing
  • 367 - Communications, electrical: acoustic wave systems and devices