3801336

Information

• Patent Grant
• 3801336

• References
• Source

• Patent Number

  3,801,336

• Date Filed

  Not available

• Date Issued

  Tuesday, April 2, 1974
  50 years ago

• CPC

  • C03C4/06 - for phototropic or photochromic glass
  • C03B23/22 - Uniting glass lenses
  • C03C3/064 - containing boron
  • C03C3/072 - containing boron
  • C03C3/074 - containing zinc
  • G02C7/06 - bifocal multifocal; progressive
  • G02C7/102 - Photochromic filters
  • G02C2202/16 - Laminated or compound lenses
  • Y10S501/903 - having refractive index less than 1.8 and ABBE number less than 70

• US Classifications

  • 501 - Compositions: ceramic
  • 065 - Glass manufacturing
  • 351 - Optics: eye examining, vision testing and correcting