Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Magnifying glass
Magnetic element with top shield coupled side shield lamination
Pressure washer
Automatic stop and restart device for an engine
Harmonic sensor
Methods and systems for managing electronic messages
Discovery, analysis, and visualization of dependencies
  Randomly Featured Patents
Versatile tamper-evident food container
Dog chew
Device for light flux attenuation, especially for additional quenching of scintillations at radionuclide activity determination
Inosine producing microorganism belonging to the genus Corynebacterium and process of producing inosine using the same
Cosmetic use of natural microfibrils and a film-forming polymer as a composite coating agent for hair, eyelashes, eyebrows and nails
Method of making deformation test samples of solid single crystals
Ducted propeller aircraft
Motor drive for cameras
Gas turbine engine reverse-flow combustor
Semiconductor device with split gate electrode structure and method for manufacturing the semiconductor device