3871750

Information

• Patent Grant
• 3871750

• References
• Source

• Patent Number

  3,871,750

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1975
  49 years ago

• CPC

  • G02B17/023 - for extending or folding an optical path
  • G02B5/04 - Prisms
  • G02B15/00 - Optical objectives with means for varying the magnification
  • G02B17/045 - having static image erecting or reversing properties only
  • G03B3/06 - using movable reflectors to alter length of light path
  • G03B15/00 - Special procedures for taking photographs Apparatus therefor
  • G09B9/08 - for teaching control of aircraft
  • G09B9/326 - the image being transformed by optical means

• US Classifications

  • 359 - Optical: systems and elements
  • 434 - Education and demonstration