3885422

Information

• Patent Grant
• 3885422

• References
• Source

• Patent Number

  3,885,422

• Date Filed

  Not available

• Date Issued

  Tuesday, May 27, 1975
  50 years ago

• CPC

  • G03F3/101 - Colour or tonal value checking by non-photographic means or by means other than using non-impact printing methods or duplicating or marking methods covered by B41M5/00
  • G01B17/00 - Measuring arrangements characterised by the use of subsonic, sonic or ultrasonic vibrations
  • H04N1/40025 - Circuits exciting or modulating particular heads for reproducing continuous tone value scales

• US Classifications

  • 073 - Measuring and testing
  • 216 - Etching a substrate: processes