3591252

Information

• Patent Grant
• 3591252

• References
• Source

• Patent Number

  3,591,252

• Date Filed

  Not available

• Date Issued

  Tuesday, July 6, 1971
  53 years ago

• CPC

  • G06K9/745 - the filter being related to phase processing
  • G02B5/32 - Birefringent or phase retarding elements
  • G03B27/44 - for multiple copying of the same original at the same time
  • G03F7/70466 - Multiple exposures
  • Y10S359/90 - Methods

• US Classifications

  • 359 - Optical: systems and elements
  • 430 - Radiation imagery chemistry: process, composition, or product thereof