3867798

Information

• Patent Grant
• 3867798

• References
• Source

• Patent Number

  3,867,798

• Date Filed

  Not available

• Date Issued

  Tuesday, February 25, 1975
  49 years ago

• CPC

  • B24B13/0012 - for multifocal lenses
  • B24B13/02 - by means of tools with abrading surfaces corresponding in shape with the lenses to be made

• US Classifications

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