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
Semiconductor devices having multi-width isolation layer structures
Pyrrolidine-1,2-dicarboxamide derivatives
Reserving a time block in a calendar application to account for a travel time between geographic locations of appointments
Video recording and playing apparatus and its control method
Semiconductor device having a plurality of elements on one semiconductor substrate and method of manufacturing the same
Split-ring resonator creating a photonic metamaterial
Base station apparatus and communication control method
  Randomly Featured Patents
Electron gun with electron beam converging member disposed between quadrupole and main lens and a cathode ray tube employing the same
Ink jet recording with equal amounts of mono- and mixed color droplets
Identification system for footwear
Vehicle-mounted apparatus and guidance system
Toner fixing arrangement in electrostatic printers and copiers
Bone conducting hearing aid
System constraints method of determining minimum and maximum torque limits for an electro-mechanical powertrain system
Dental turbine drive
Assembly for use in electromagnetic actuator
Systems for wireless authentication based on bluetooth proximity