US PATENT SUBCLASS 347 / 120
.~.~ By information carrying flow of invisible charged particles

Current as of: June, 1999
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347 /   HD   INCREMENTAL PRINTING OF SYMBOLIC INFORMATION

111  DF  ELECTRIC MARKING APPARATUS OR PROCESSES {3}
112  DF  .~ Electrostatic {8}
120.~.~ By information carrying flow of invisible charged particles {3}
121  DF  .~.~.~> Electron beam generator with air tight envelope {1}
123  DF  .~.~.~> Specific ionographic head {3}
128  DF  .~.~.~> Including driving circuitry

DEFINITION

Classification: 347/120

By information carrying flow of invisible charged particles:

(under subclass 112) Subject matter wherein a flow of nonvisible charged particles (e.g., ions, electrons) is modulated to place the electrostatic charge on the medium in imagewise form in accordance with the information signal to form the image.

(1) Note. This subclass is distinguished from ink jets, subclass 55 by the lack of direct modulation of the visible charged particles. Only the nonvisible charged particles are being directly modulated in imagewise form.

SEE OR SEARCH THIS CLASS, SUBCLASS:

55, for an ink jet printer that modulates a flow of visible particles (e.g., ink droplets, toner particles, etc.) by electric or magnetic fields to place a visible image directly on a recording medium.

124, for the subject matter of this subclass including simultaneous development wherein an unmodulated flow of toner is directly applied to, or attracted to, the recording medium by the modulated flow of nonvisible charged particles.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices, appropriate subclasses for a general ion source.

399, Electrophotography, 168+, for charging, particularly subclasses 170+ for corona.