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
Managing personal information on a network
Semiconductor light-receiving device
System for determining potential lot consolidation during manufacturing
Wire catalyst for hydrogenation/dehydrogenation reaction and manufacturing method therefor
Wall flow type exhaust gas purification filter
Packaging article
Electrifying roller
  Randomly Featured Patents
Chemical-sensitization photoresist composition
Method and system for simulating communications networks, object and computer program product therefor
Pre-cooked sandwich packaging and method of reheated sale
Information data recording and reproduction apparatus
Flow meter with a motor driven impeller
Biodegradable inflatable device
Combustion chamber structure having piston cavity
Ceramic composite with integrated compliance/wear layer
Suspension packaging assembly
Log carrier