3813172

Information

• Patent Grant
• 3813172

• References
• Source

• Patent Number

  3,813,172

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1974
  50 years ago

• CPC

  • G01J1/04 - Optical or mechnical part supplementary adjustable parts
  • G01J1/0411 - using focussing or collimating elements
  • G01J1/0414 - using plane or convex mirrors, parallel phase plates, or plane beam-splitters
  • G01J1/0437 - using masks, aperture plates, spatial light modulators, spatial filters
  • G01J1/0455 - having a throughhole enabling the optical element to fulfil an additional optical function
  • G01J1/0271 - Housings; Attachments or accessories for photometers

• US Classifications

  • 356 - Optics: measuring and testing
  • 359 - Optical: systems and elements