3623800

Information

• Patent Grant
• 3623800

• References
• Source

• Patent Number

  3,623,800

• Date Filed

  Not available

• Date Issued

  Tuesday, November 30, 1971
  53 years ago

• CPC

  • G02C7/065 - Properties on the principal line
  • B24B13/065 - using a template
  • G02C7/061 - Spectacle lenses with progressively varying focal power

• US Classifications

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