3448618

Information

• Patent Grant
• 3448618

• References
• Source

• Patent Number

  3,448,618

• Date Filed

  Not available

• Date Issued

  Tuesday, June 10, 1969
  55 years ago

• CPC

  • G01F23/2924 - for several discrete levels
  • Y10S116/05 - using light guides

• US Classifications

  • 073 - Measuring and testing
  • 040 - Card, picture, or sign exhibiting
  • 116 - Signals and indicators
  • 359 - Optical: systems and elements