US3618567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for developing latent electrographic images with liquid ink
Assignee: Varian Medical Systems Inc
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Filing: 1969-09-15
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Granted: 1971-11-09
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Expires: 1989-09-15
Abstract
Abstract An electrographic developer is disclosed which includes an ink pervious development electrode structure having a development surface over which an electrographic recording web bearing latent electric charge images to be developed is disposed. Liquid ink is forced through the ink pervious electrode structure against the image bearing surface of the recording web for developing the latent charge image pattern. The development electrode can take the form of a plate, a roller or a continuous belt. In the case of the continuous belt or roller, ink is forced through the ink pervious electrode structure from the inside and the recording web is pressed into engagement with the outer surface of the electrode structure.
Inventors
- 👤 Raymond L Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:45
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
An apparatus employing lIquid ink having a suspension of toner particles therein for developing the charge image on the charge retentive surface of a moving recording medium, comprising the combination: a rotatable drum developing electrode made of ink pervious conductive material the outside surface of which is adapted to engage the charge retentive surface of the moving recording medium as the drum rotates; liquid ink feed trough positioned proximate the inside surface of the drum development electrode and displaced slightly from top dead center in the direction of rotation for preventing ink from flowing onto the back of the recording medium; hollow axle means for supporting the rotatable drum and for distributing fresh liquid ink to the feed trough; and hydrostatic pressure means for forcing the ink from the feed trough through the porous drum development electrode and onto the charge retentive surface of the recording medium to continuously replenish the toner particles as the development proceeds and toner particles are depleted from the ink.
Claim 2
Independent Claim
165 words
An apparatus employing lIquid ink having a suspension of toner particles therein for developing the charge image on the charge retentive surface of a moving recording medium, comprising the combination: a rotatable drum developing electrode made of ink pervious conductive material the outside surface of which is adapted to engage the charge retentive surface of the moving recording medium as the drum rotates; liquid ink feed trough positioned proximate the inside surface of the drum development electrode and displaced slightly from top dead center in the direction of rotation for preventing ink from flowing onto the back of the recording medium; hollow axle means for supporting the rotatable drum and for distributing fresh liquid ink to the feed trough; and hydrostatic pressure means for forcing the ink from the feed trough through the porous drum development electrode and onto the charge retentive surface of the recording medium to continuously replenish the toner particles as the development proceeds and toner particles are depleted from the ink.
Claim 3
Dependent Claim
46 words
The apparatus of claim 1, wherein the feed trough includes a skirt structure extending in an arc around the inside surface of the drum in the direction of rotation for establishing a hydrostatic pressure head on the liquid ink contained between the skirt and the drum.
Claim 4
Independent Claim
142 words
An apparatus for developing the charge image on the charge retentive surface of a moving recording medium with liquid ink-containing particles of toners suspended therein, comprising the combination: a development electrode which is pervious to the liquid ink and has an upper surface adapted to engage the charge retentive surface of the recording medium; liquid ink feed trough positioned proximate the underside of the development electrode for supplying liquid ink against the undersurface of the development electrode; a skirt extending from the feed trough along the underside of the development electrode and proximate to the development electrode defining a liquid ink distribution channel; and pump means for forcing the liquid ink from the feed trough into the ink distribution chamber between the skirt and the development electrode and through the development electrode and onto the charge retentive surface of the recording medium.
Claim 5
Independent Claim
142 words
An apparatus for developing the charge image on the charge retentive surface of a moving recording medium with liquid ink-containing particles of toners suspended therein, comprising the combination: a development electrode which is pervious to the liquid ink and has an upper surface adapted to engage the charge retentive surface of the recording medium; liquid ink feed trough positioned proximate the underside of the development electrode for supplying liquid ink against the undersurface of the development electrode; a skirt extending from the feed trough along the underside of the development electrode and proximate to the development electrode defining a liquid ink distribution channel; and pump means for forcing the liquid ink from the feed trough into the ink distribution chamber between the skirt and the development electrode and through the development electrode and onto the charge retentive surface of the recording medium.
Claim 6
Dependent Claim
45 words
The apparatus of claim 3, wherein the development electrode is formed in a rotatable closed loop the outside surface of which engages the charge retentive surface of the recording medium and the inside surface of which is disposed toward the feed trough and the skirt.
Claim 7
Dependent Claim
39 words
The apparatus of claim 4, wherein the feed trough is displaced slightly from top dead center of the loop development electrode in the direction of rotation for preventing liquid ink from flowing onto the back of the recording medium.
Claim 8
Dependent Claim
44 words
The apparatus of claim 4, wherein the area of engagement between the recording medium and the outside surface of the loop development electrode is at least partially coextensive with the area of the distribution channel along the inside surface of the loop development electrode.
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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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |