2978690

Information

• Patent Grant
• 2978690

• References
• Source

• Patent Number

  2,978,690

• Date Filed

  Not available

• Date Issued

  Tuesday, April 4, 1961
  63 years ago

• CPC

  • B06B3/04 - involving focusing or reflecting

• US Classifications

  • 033 - Geometrical instruments
  • 073 - Measuring and testing
  • 340 - Communications: electrical
  • 342 - Communications: directive radio wave systems and devices
  • 367 - Communications, electrical: acoustic wave systems and devices
  • 441 - Buoys, rafts, and aquatic devices
  • 455 - Telecommunications