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
Method and apparatus for filter-less class D audio amplifier EMI reduction
Quinoline compounds and their use for treating viral infection
Electronic system with vertical intermetallic compound
Storage device having clock adjustment circuitry with firmware-based predictive correction
System and method for redundant array copy removal in a pointer-free language
Mitigating single point failure of devices in an analyte monitoring system and methods thereof
Method and apparatus for optimizing transmission diversity
  Randomly Featured Patents
Detection of hydrogen peroxide with optical indicator chalcogen compounds
Photoimageable composition
Inflatable chair
Capacitive key touch sensing using analog inputs and digital outputs
Crane equipped with inspection device
Head lamp device for vehicle
Powder coating thickness gauge
Method and apparatus for cache memory management
Multiple payload cartridge employing single pair of electrical connections