Resources Contact Us Home
Method and apparatus for improved retention copying

Image Number 5 for United States Patent #4531827.

A method of producing multiple copies of an original document with a minimum number of document imaging scannings includes impressing an electrostatic image of a reference density patch on the charge receptor together with an image of the document, detecting the potential of the patch, comparing the detected potential with a reference level, and controlling further copy production in accordance with the results of such comparison, so that additional copies are produced from the electrostatic image of the document without reimaging until the detected potential of the patch image drops below the reference level, at which time the patch and document are reimaged to form new electrostatic images of the patch and document on the charge receptor for the production of additional copies.

  Recently Added Patents
Hydrogenolysis of ethyl acetate in alcohol separation processes
Optical interconnect in high-speed memory systems
Method and system for scaling usage of a social based application on an online social network
Generating wiki pages from content and transformation objects
Luggage wheel housing with wheel
Acceleration based mode switch
Front cover of an electronic device
  Randomly Featured Patents
Mirror sight apparatus for guns
Control mechanism for the rapier heads of weaving machines
Clamping load distributor and top stop for a fuel injector
Head lamp for cornering operation
Spring-loaded, removable test fixture for circuit board testers
NAND flash memory devices having shielding lines between wordlines and selection lines
Electrocatalytic deposition of metals in solid polymeric matrices
Dark room safe light filter assembly for a TV set
Apparatus of controlling tracking for a disk