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 systems for automated segmentation of dense cell populations
Preserving user applied markings made to a hardcopy original document
Determination of statistical upper bound for estimate of noise power spectral density
Circuit and method for generating an AC voltage from a plurality of voltage sources having a temporally variable DC output voltage
Testing SQL query writing skills
Watch dial
Battery pack with connecting device
  Randomly Featured Patents
Solid-propellant rocket engine with inner and outer burner surfaces
Method for forming a hollow plastic product
Single sheathing roof panel
Variable length code demodulating apparatus and address control method thereof
Method and apparatus for dispensing tape
Phrase generation
Computer system and a method of deploying an application in a computer system
Noiseless, printable self-adhesive tape
Distributor for viscous fluids with multiple radial; discharge