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
Method of synchronization for low power idle
Technique for manufacturing bit patterned media
Perfume bottle
Pattern identification apparatus, control method and program thereof
Power-saving receiver
System and methods for weak authentication data reinforcement
  Randomly Featured Patents
Method and apparatus for conditioning refuse
Aqueous liquid detergent containing an N-acylaspartate and a betaine or imidazoline surfactant
Tool box
Snapshot reset method and apparatus
Hydraulic braking system with hydraulic booster
Solar augmented geothermal energy
Preformed coronary artery guide catheter
6,7-(epithio)-3,7-dimethyl-1,3-octadiene and use thereof in augmenting or enhancing aroma of perfume compositions, colognes and perfurmed articles
Coordinate input device for preventing delamination of transfer portion
Operating unit for an electrohydraulic braking system