3420006

Information

• Patent Grant
• 3420006

• References
• Source

• Patent Number

  3,420,006

• Date Filed

  Not available

• Date Issued

  Tuesday, January 7, 1969
  56 years ago

• CPC

  • B24B13/0012 - for multifocal lenses

• US Classifications

  • 451 - Abrading
  • 065 - Glass manufacturing
  • 359 - Optical: systems and elements