US3635157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for electrostatically charging particles for printing or coating
Assignee: Continental Can Co Inc
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Filing: 1968-12-30
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Granted: 1972-01-18
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Expires: 1988-12-30
Abstract
Abstract Provisions for electrostatically charging particles, as in an electrostatic printing operation, include a corona source for providing ionization in a predetermined region, a plate electrode spaced from the corona source, a grid electrode adjacent the corona source and spaced from the plate electrode and a nozzle for directing a flow of the finely divided particles intermediate the plate and grid electrodes. The grid electrode draws ions from the corona source into the region intermediate the plate and grid electrodes. A rotatable drum may be provided proximate the region of electrostatic charging of the particles to receive the particles on the surface thereof for transportation to a printing or application zone. Alternatively, a stencil screen may be provided proximate the region of charging of the particles to direct passage of the particles therethrough to define a desired image upon a substrate proximate the stencil screen.
Inventors
- 👤 James R A Taylor
- 👤 William A Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:49
CPC Classifications
B; B41; B41F; B41F15/00; B41F17/00; G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
47 words
The combination according to claim 1 further comprising an auxiliary corona source adjacent the peripheral surface of said drum and spaced circumferentially from said corona source means, plate and grid electrodes for maintaining a charge upon the toner particles applied to the peripheral surface of said drum.
Claim 2
Dependent Claim
46 words
The combination according to claim 1 further comprising means for establishing a field located circumferentially along the peripheral surface of said drum from said corona source means, plate and grid electrodes and spaced from the peripheral surface of said drum for withdrawing toner particles from said
Claim 3
Dependent Claim
141 words
Electrostatic apparatus for depositing particles in a pattern upon a substrate comprising means for charging a plurality of finely divided particles including corona source means for the production of ions, a plate electrode having a first potential and spaced from said corona source means, a grid electrode having the same potential of like polarity with respect to said plate electrode and adjacent said corona source means and spaced from said plate electrode for drawing ions from said corona source means for passage to the region between said grid electrode and said plate electrode and for maintaining ions in said region, means for directing finely divided particles between said grid electrode and plate electrode for charging said particles in said region therebetween, and pattern producing means adjacent said region for defining the pattern to be produced by said particles upon a substrate.
Claim 4
Dependent Claim
44 words
Apparatus according to claim 4, said pattern producing means including stencil means located adjacent to said region for limiting the passage of finely divided particles from said region between said two electrodes to produce a pattern of said finely divided particles upon a substrate.
Claim 5
Dependent Claim
35 words
Apparatus according to claim 5 wherein said stencil means comprises a screen having a potential opposite in polarity to said first potential, and masking means for masking portions of said screen to define said pattern.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 4 wherein said means for directing finely divided particles between said grid electrode and plate electrode comprises a nozzle opening into said area for directing a cloud of particles therethrough.
Claim 7
Dependent Claim
62 words
Apparatus according to claim 4 wherein said corona source means comprises ionizing electrode means having a relatively high potential of the same polarity and higher than the potential of the grid electrode and the plate electrode, said grid electrode comprising a metallic screen, whereby ions are drawn through said screen and into the region between said grid electrode and said plate electrode.
Claim 8
Dependent Claim
28 words
Apparatus according to claim 4, said pattern producing means including a rotatable drum located adjacent to said region for intercepting said particles and transferring them to a substrate.
Claim 9
Independent Claim
114 words
The method of electrostatically depositing a pattern of charged particles upon a substrate by applying a charge to finely divided particles including the steps of providing a corona source, locating a plate electrode spaced from the corona source, locating a grid electrode between the corona source and the plate electrode and spaced from the plate electrode, energizing the corona source to produce ions of a predetermined polarity, applying equal potentials of the predetermined polarity to the grid and plate electrodes to maintain the produced ions therebetween, directing a flow of particles intermediate the plate electrode and grid electrode for charging said particles by the produced ions, and thereafter depositing said particles upon a substrate.
Claim 10
Dependent Claim
74 words
The method according to claim 10 wherein the step of providing a corona source includes providing at least one corona needle and said step of energizing the corona source includes applying a potential to the at least one needle higher than and of the same polarity as the potentials applied to the grid and plate electrodes for drawing the produced ions through the grid electrode into the region intermediate the grid and plate electrodes.
Claim 11
Dependent Claim
57 words
The method according to claim 10 further including the step of locating a pattern producing member in the path of flow of particles and outside the region between the grid and plate electrodes, and applying to said pattern producing member a potential to aid withdrawal of charged particles from the region intermediate the grid and plate electrodes.
Claim 12
Dependent Claim
111 words
Electrostatic apparatus for depositing a pattern of toner upon a substrate, said apparatus comprising pattern producing means, a corona source means for producing ions, a first electrode spaced from said corona source means, a second electrode comprising a grid, said grid being located in spaced relation to and between said corona source means and said first electrode, means for applying equal potentials to said first electrode and said grid for maintaining ions produced by said corona source means in the region between said first electrode and said grid, and means for passing toner through said region and beyond said first electrode and said grid into contact with said pattern producing means.
Claim 13
Dependent Claim
21 words
Apparatus as defined in claim 13 wherein said pattern producing means includes a rotatable drum for transferring toner to the substrate.
Claim 14
Dependent Claim
25 words
Apparatus as defined in claim 13 wherein said pattern producing means includes a stenCil screen for allowing toner to pass therethrough and onto the substrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |