3275445

Information

• Patent Grant
• 3275445

• References
• Source

• Patent Number

  3,275,445

• Date Filed

  Not available

• Date Issued

  Tuesday, September 27, 1966
  58 years ago

• CPC

  • G03F5/16 - using grey half-tone screens

• US Classifications

  • 359 - Optical: systems and elements