Resources Contact Us Home
Process and device for copying photographic color images

Image Number 2 for United States Patent #4050807.

A blocking filter is used, in conjunction with the substractive filter method of copying photographic color images, to remove or substantially remove by greatly weakening wave lengths from the copying light in the range in which the filter characteristics of the blue and green color filters or the spectral sensitivity curves of photographic copying paper overlap each other, or more particularly in a 30 nm belt about a central wave length of approximately 500 nm.

  Recently Added Patents
Methods and apparatus for power amplifier calibration
Authorization method for location based services
Information processing apparatus, information outputting method and computer program storage device
Method and apparatus for web crawling
Electro-optical device, method of manufacturing the same, and electronic apparatus
Image forming apparatus with enhanced display of guidance information
Optical imaging device and imaging method for microscopy
  Randomly Featured Patents
Process for isolating and preparing purified chitin deacetylase
Portable shooter's rest
Hearing aid system
Optical position measuring device
Automotive turn signal switch
Vacuum separator
Method of preparing dough
Speech recognizer
Wire retriever system
Error removal method for a multi-track tape recorder system