3751138

Information

• Patent Grant
• 3751138

• References
• Source

• Patent Number

  3,751,138

• Date Filed

  Not available

• Date Issued

  Tuesday, August 7, 1973
  51 years ago

• CPC

  • B29D11/00855 - Producing cylindrical lenses
  • G02B3/0081 - having one or more elements with analytic function to create variable power
  • G02B3/04 - with continuous faces that are rotationally symmetrical but deviate from a true sphere
  • G02B13/08 - Anamorphotic objectives
  • G02C7/081 - Ophthalmic lenses with variable focal length

• US Classifications

  • 359 - Optical: systems and elements
  • 351 - Optics: eye examining, vision testing and correcting