1868834

Information

• Patent Grant
• 1868834

• References
• Source

• Patent Number

  1,868,834

• Date Filed

  Not available

• Date Issued

  Tuesday, July 26, 1932
  92 years ago

• CPC

  • G02B5/20 - Filters
  • G03B21/60 - characterised by the nature of the surface
  • G03C11/10 - for protection from ultra-violet light

• US Classifications

  • 359 - Optical: systems and elements