3718078

Information

• Patent Grant
• 3718078

• References
• Source

• Patent Number

  3,718,078

• Date Filed

  Not available

• Date Issued

  Tuesday, February 27, 1973
  52 years ago

• CPC

  • G02B5/0215 - the surface having a regular structure
  • G02B3/08 - with discontinuous faces
  • G02B5/0221 - the surface having an irregular structure
  • G02B5/0284 - used in reflection
  • G03B13/18 - Focusing aids
  • G03B13/26 - with magnifiers for inspecting image formed on screen

• US Classifications

  • 359 - Optical: systems and elements
  • 264 - Plastic and nonmetallic article shaping or treating: processes