2681589

Information

• Patent Grant
• 2681589

• References
• Source

• Patent Number

  2,681,589

• Date Filed

  Not available

• Date Issued

  Tuesday, June 22, 1954
  70 years ago

• CPC

  • G02B3/04 - with continuous faces that are rotationally symmetrical but deviate from a true sphere
  • B60R1/005 - specially adapted for viewing traffic-lights

• US Classifications

  • 359 - Optical: systems and elements