US3685488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic development
Assignee: Xerox Corp
•
Filing: 1970-07-10
•
Granted: 1972-08-22
•
Expires: 1990-07-10
Abstract
Abstract Apparatus is herein disclosed for developing a latent electrostatic image on the surface of a moving image retaining member. An extended electrode is positioned adjacent the moving surface to form a development zone therebetween. Means are provided to move a closely packed flow of two component developer material moving through the development zone in contact with the photoreceptor wherein toner particles are electrostatically exchanged between the developer material and the imaged areas on the photoreceptor. Biasing means are provided to place the backing electrode at a potential to enhance the developability of the system.
Inventors
- 👤 Raymond W Stover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801; G03G15/082
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
The apparatus according to claim 1 further including biasing means operatively connected to said extended member to place said extended member at a potential to enhance the developability of the image on said image retaining element.
Claim 2
Dependent Claim
61 words
The apparatus according to claim 2 wherein said extended member is biased to a polarity similar to that of the image retained on the image retaining element and to a potential having a magnitude greater than the potential in the non-image areas of said image retaining element but less than the potential in the image areas of said image retaining element.
Claim 3
Dependent Claim
20 words
The apparatus according to claim 3 in which said image retaining element is moved in the direction of developer flow.
Claim 4
Dependent Claim
24 words
The apparatus according to claim 3 in which said image retaining element is moved in a direction opposite to that of the developer flow.
Claim 5
Dependent Claim
115 words
Apparatus for developing a latent electrostatic image supported upon the surface of an image retaining element including a continuous electrode member mounted adjacent to the surface of the image retaining element, said member being arranged to provide a substantially enclosed, progressively more restrictive flow zone therebetween, means to induce a flow of closely packed electroscopic developer material in said flow zone such that the flow moves from the less restrictive end thereof towards the more restrictive end means to move the image retaining element in contact with the closely packed developer material wherein the images thereon are developed, and means to bias said continuous member to a potential to enhance development in said flow zone.
Claim 6
Dependent Claim
20 words
The apparatus of claim 6 wherein the image retaining element is moved in opposition to the flow of developer material.
Claim 7
Dependent Claim
40 words
The apparatus of claim 7 further including a biased grid positioned in the less restrictive end of said flow zone to control development in the region at which developer material first comes in contact with said moving image retaining element.
Claim 8
Dependent Claim
30 words
The apparatus of claim 8 wherein said control grid is placed at a potential to inhibit background development in the region where the image retaining element leaves the flow zone.
Claim 9
Dependent Claim
18 words
The apparatus of claim 6 wherein said image retaining element is moved in the direction of developer flow.
Claim 10
Dependent Claim
33 words
The apparatus of claim 6 further including means to replenish the developer material after leaving said flow zone, and means to deliver said replenished developer material to the start of said flow zone.
Claim 11
Dependent Claim
39 words
The apparatus of claim 10 wherein said electrode member is biased to a polarity similar to the polarity of the images retained on said image retaining element and a potential between the image and background potential on said element.
Claim 12
Dependent Claim
25 words
The apparatus of claim 12 wherein said image retaining element is moved at a rate in excess of the flow rate of the developer material.
References Cited (Backward Citations)
US2952241A
Cited
US3216844A
Cited
US3542579A
Cited
US3503776A
Cited
US3545968A
Cited
US3448724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |