Patent US6416508B1 successfully refreshed from Google Patents.
US3651784A
Expired / Lapsed
US
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Low potential development electrode
Assignee: Xerox Corp
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Filing: 1969-07-03
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Granted: 1972-03-28
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Expires: 1989-07-03
Abstract
Abstract A low potential electrode for use in a xerographic development system. The electrode is positioned adjacent to the point of entry of a moving image bearing photoconductive surface into a development zone and has associated therewith means for redirecting the flow of developer material moving between the electrode and the photoconductive surface whereby the developer material impinges against the photoconductive surface.
Inventors
- 👤 Robert E Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:05
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
199 words
Apparatus for controlling the movement of two-component developer material which is flowing through a development zone in close proximity to a moving latent electrostatic image bearing member, including: an electrode positioned in the development zone in a closely spaced parallel relationship with the latent electrostatic image bearing member, said electrode being located in a region of the development zone wherein a latent image being transported on the image bearing member initially engages the developer material; means, associated with said electrode, for directing the flow of the developer material in substantially a parallel direction relative to said electrode along a first portion thereof; means, associated with said electrode, for redirecting the flow of the developer material from being in substantially a parallel direction relative to said electrode along the first portion thereof to being substantially in a transverse direction relative to said electrode along a second portion thereof, thereby effecting the impingement of the developer material with the image bearing member; means for electrically biasing said electrode to a potential less than any potential on the image bearing member; and means for moving the image bearing member in a direction opposed to the direction of movement of the developer material.
Claim 2
Dependent Claim
199 words
Apparatus for controlling the movement of two-component developer material which is flowing through a development zone in close proximity to a moving latent electrostatic image bearing member, including: an electrode positioned in the development zone in a closely spaced parallel relationship with the latent electrostatic image bearing member, said electrode being located in a region of the development zone wherein a latent image being transported on the image bearing member initially engages the developer material; means, associated with said electrode, for directing the flow of the developer material in substantially a parallel direction relative to said electrode along a first portion thereof; means, associated with said electrode, for redirecting the flow of the developer material from being in substantially a parallel direction relative to said electrode along the first portion thereof to being substantially in a transverse direction relative to said electrode along a second portion thereof, thereby effecting the impingement of the developer material with the image bearing member; means for electrically biasing said electrode to a potential less than any potential on the image bearing member; and means for moving the image bearing member in a direction opposed to the direction of movement of the developer material.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein the said electrode is maintained at a ground potential.
Claim 4
Dependent Claim
146 words
In a xerographic developing apparatus of the type wherein a rotatable photosensitive drum is moved through a development zone and in which a continuous flow of two-component developer material is moved in close proximity with said drum surface, the apparatus including means to rotate the drum in opposition to the flow of developer material, an electrode positioned in the development zone in close parallel relation to the moving drum surface adjacent to the start of said development zone at which point the latent electrostatic image moves into close proximity with said flow of two-component developer material, means to electrically bias said electrode to a potential less than any potential on the drum surface, and means associated with said electrode to redirect the flow of developer material moving through the start of the development region and said electrode between the drum into impingement against the drum surface.
Claim 5
Dependent Claim
146 words
In a xerographic developing apparatus of the type wherein a rotatable photosensitive drum is moved through a development zone and in which a continuous flow of two-component developer material is moved in close proximity with said drum surface, the apparatus including means to rotate the drum in opposition to the flow of developer material, an electrode positioned in the development zone in close parallel relation to the moving drum surface adjacent to the start of said development zone at which point the latent electrostatic image moves into close proximity with said flow of two-component developer material, means to electrically bias said electrode to a potential less than any potential on the drum surface, and means associated with said electrode to redirect the flow of developer material moving through the start of the development region and said electrode between the drum into impingement against the drum surface.
Claim 6
Dependent Claim
22 words
The apparatus of claim 3 wherein at least a portion of saId electrode is located below the horizontal centerline of said drum.
Claim 7
Dependent Claim
14 words
The apparatus of claim 4 wherein said electrode is maintained at a ground potential.
Claim 8
Dependent Claim
21 words
The apparatus of claim 4 wherein said electrode is maintained at approximately 150 volts below any potential on the drum surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |