3874777

Information

• Patent Grant
• 3874777

• References
• Source

• Patent Number

  3,874,777

• Date Filed

  Not available

• Date Issued

  Tuesday, April 1, 1975
  49 years ago

• CPC

  • G02C7/06 - bifocal multifocal; progressive
  • C03B11/08 - for making solid articles
  • C03B19/02 - by casting molten glass
  • C03B23/22 - Uniting glass lenses
  • C03B2215/406 - Products comprising at least two different glasses
  • C03B2215/48 - Convex-concave
  • C03B2215/49 - Complex forms not covered by groups C03B2215/47 or C03B2215/48
  • Y02P40/57 - Reduction of reject rates Improving the yield

• US Classifications

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