3471976

Information

• Patent Grant
• 3471976

• References
• Source

• Patent Number

  3,471,976

• Date Filed

  Not available

• Date Issued

  Tuesday, October 14, 1969
  55 years ago

• CPC

  • B24B13/0012 - for multifocal lenses
  • G02C7/041 - bifocal; multifocal
  • G02C7/06 - bifocal multifocal; progressive

• US Classifications

  • 451 - Abrading
  • 351 - Optics: eye examining, vision testing and correcting