3718397

Information

• Patent Grant
• 3718397

• References
• Source

• Patent Number

  3,718,397

• Date Filed

  Not available

• Date Issued

  Tuesday, February 27, 1973
  51 years ago

• CPC

  • G01J1/14 - using comparison with a surface of graded brightness
  • G03B27/72 - Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

• US Classifications

  • 355 - Photocopying
  • 356 - Optics: measuring and testing
  • 396 - Photography
  • 399 - Electrophotography
  • 430 - Radiation imagery chemistry: process, composition, or product thereof