3662040

Information

• Patent Grant
• 3662040

• References
• Source

• Patent Number

  3,662,040

• Date Filed

  Not available

• Date Issued

  Tuesday, May 9, 1972
  52 years ago

• CPC

  • B29D11/00932 - Combined cutting and grinding thereof
  • B23B5/40 - for turning spherical surfaces inside or outside
  • B24B13/0012 - for multifocal lenses
  • B29D11/00028 - Bifocal lenses; Multifocal lenses

• US Classifications

  • 264 - Plastic and nonmetallic article shaping or treating: processes
  • 351 - Optics: eye examining, vision testing and correcting
  • 451 - Abrading