3665179

Information

• Patent Grant
• 3665179

• References
• Source

• Patent Number

  3,665,179

• Date Filed

  Not available

• Date Issued

  Tuesday, May 23, 1972
  52 years ago

• CPC

  • F21V17/02 - with provision for adjustment
  • F21V7/07 - with hyperbolic curvature
  • F21V9/04 - for filtering out infra-red radiation
  • F21V9/08 - for producing coloured light
  • F21V5/045 - the lens having discontinuous faces
  • F21V31/03 - with provision for venting
  • F21W2131/406 - for theatres, stages or film studios

• US Classifications

  • 362 - Illumination
  • 359 - Optical: systems and elements