Patent US3696784A successfully refreshed from Google Patents.
US3696784A
Expired / Lapsed
US
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Xerographic development apparatus
Assignee: Xerox Corp
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Filing: 1970-12-15
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Granted: 1972-10-10
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Expires: 1990-12-15
Abstract
Abstract This invention relates to an electroded cascade development system wherein an extended electrically conductive electrode plate is closely spaced from a xerographic surface being developed. The xerographic surface is moved in an uphill direction against the direction flow of the cascading developer. The electrode is completely insulated electrically from its surrounding whereby it is electrically floating with respect to ground and the image bearing surface for improved development of latent electrostatic images developed under its influence.
Inventors
- 👤 Marshall Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
Xerographic development apparatus including a latent electrostatic image bearing member adapted to be developed, means to move the latent electrostatic image bearing member upwardly through a development zone, means to cascade a quantity of two components of developer material down the latent electrostatic image bearing member being developed, and a normally unbiased, electrically isolated, development electrode formed of a conductive member being spaCed less than 0.20 inches from the image bearing member such that a varying bias response to the electrical charge carried on said plate surface is induced in said electrode.
Claim 2
Dependent Claim
92 words
Xerographic development apparatus including a latent electrostatic image bearing member adapted to be developed, means to move the latent electrostatic image bearing member upwardly through a development zone, means to cascade a quantity of two components of developer material down the latent electrostatic image bearing member being developed, and a normally unbiased, electrically isolated, development electrode formed of a conductive member being spaCed less than 0.20 inches from the image bearing member such that a varying bias response to the electrical charge carried on said plate surface is induced in said electrode.
Claim 3
Dependent Claim
96 words
A xerographic development apparatus for making visible a latent electrostatic image supported upon a photoconductive member including means to move the image bearing plate through a development zone, an unbiased electrically isolated development electrode positioned within the development zone in close parallel relation to said plate at a distance to induce a bias in said electrode that varies in response to the electrical charge carried on said plate, and means to move a quantity of developer material through the development zone between said electrode and said plate whereby the electrostatic image carried thereon is made visible.
Claim 4
Dependent Claim
96 words
A xerographic development apparatus for making visible a latent electrostatic image supported upon a photoconductive member including means to move the image bearing plate through a development zone, an unbiased electrically isolated development electrode positioned within the development zone in close parallel relation to said plate at a distance to induce a bias in said electrode that varies in response to the electrical charge carried on said plate, and means to move a quantity of developer material through the development zone between said electrode and said plate whereby the electrostatic image carried thereon is made visible.
Claim 5
Dependent Claim
55 words
The apparatus of claim 2 further including an electrically biased input chute positioned at the developer entrance to the development zone to control the flow of developer material therein, and electrical insulating means positioned between said input chute and said electrode whereby a continuous surface is presented to developer material moving through the development zone.
Claim 6
Dependent Claim
17 words
The apparatus of claim 2 wherein said electrode is positioned less than 0.20 inches from said plate.
Claim 7
Dependent Claim
22 words
The apparatus of claim 4 wherein the plate is moved through the development zone in opposition to the flow of developer material.
References Cited (Backward Citations)
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US3472657A
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US3357399A
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US3412710A
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US3416494A
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US3527387A
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US3599605A
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |