A developer material comprising colored toner particles having a particle size less than about 30 microns and a minor proportion of submicroscopic silicon dioxide additive particles having at least a portion of the silicon atoms on the outside surface of the silicon dioxide particles directly attached through an oxygen atom to another silicon atom which is in turn directly attached through a carbon linkage to one to three organic groups.

This invention relates to a method and apparatus for creating high shear stresses in a particulate suspension prior to use of such suspension for imaging or inking. The method and apparatus in one environment function to stress a thin layer of an electrophoretic suspension of particles in a liquid carrier. The prestressed suspension is better suited than unstressed suspensions for preparing both monchromatic and polychromatic copies from originals by particle migration through the suspension whe...

A partially migrated migration imaged member comprising a softenable layer and migration marking material partially migrated in image configuration in depth in said softenable layer in response to an electrical latent image of a first polarity is uniformly charged to a low potential opposite the polarity of the electrical latent image of a first polarity, either with or without uniform, e.g., ambient exposure to electromagnetic radiation to thereby desensitize the partially migrated image to fur...

A lens strip optical system for use in a copying machine wherein the original to be copied is supported in a flat stationary condition and a flowing light image of the original is recorded upon a moving photosensitive member.

An imaging method wherein an imaging member comprising an imaging layer, structurally fracturable in response to the combined effects of electromagnetic radiation to which it is sensitive and applied electric field sandwiched between a donor sheet and a receiver sheet is subjected to a first electric field. Such field is then modified as by reducing, grounding or reversing the field. After such modification the first field is substantially restored across the imaging layer prior to imagewise exp...

An imaging process which comprises selectively eliminating or adding imagewise at least a component of a system consisting of a hydrophilic macromolecular substance, a metal ion, a compound capable of maintaining the pH value of the surrounding medium at not less than 8 when brought into contact with water or a substance which provides such a compound when decomposed and a compound represented by the following general formula: ##SPC1## Wherein Z,z' : non-metallic atoms constituting heterocyclic ...

A Manifold imaging system wherein a cohesively weak photoresponsive imaging layer is sandwiched between two sheets. The imaging layer is exposed to a pattern of actinic electromagnetic radiation and an electric field providing upon separation of the sheets a positive image on one sheet and a negative image on the other.

A device for flash imaging, through an imaging mask at an imaging film plane, a dry-process imaging film having a layer of an energy dispersible image forming material on a surface thereof. The device comprises a solid, electromagnetic energy transmitting body advantageously in the form of a quartz prism having a generally frusto-pyramidal configuration. The energy transmitting body is associated with a source of electromagnetic energy, and acts to collect, direct, collimate and shape the energy...

3-Bromo-N-2"-pyridyl-8,13-dioxodinaphtho-(2,1-b;3',3'-d)-furan-6-carboxamid e is described as a new composition of matter along with its use in electrophotographic and photoelectrophoretic imaging processes.

An electrostatographic imaging process comprising the steps of providing an electrostatographic imaging member having a recording surface, forming an electrostatic latent image on said recording surface, and contacting said electrostatic latent image with a developer mixture comprising classified toner materials electrostatically clinging to the surface of classified high surface area carrier materials, said classified toner materials having a particle size number distribution with a fine index ...