US3741156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic development apparatus
Assignee: Xerox Corp
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Filing: 1971-04-13
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Granted: 1973-06-26
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Expires: 1991-04-13
Abstract
Abstract A cascading development apparatus which is equipped with a developer pool at the upper portion of the development zone and a development electrode at the lower portion that provides high development efficiency, good solid area coverage and reduced background density.
Inventors
- 👤 S Jo
- 👤 K Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
216 words
In a xerographic copying apparatus; a rotatable member having a photosensitive surface thereon; an electrostatic latent image on said surface, means developing said latent image; said developing means comprising: a conductive wall spaced from said photosensitive surface, an electrode connected to said conductive wall at the lower end thereof and spaced from said photosensitive surface at a distance which is less than the spacing therefrom of said conductive wall, and insulating means located between said conductive wall and said electrode to electrically separate the same; a developer sump containing developer therein; means for delivering developer from said sump to the space between said conductive wall and said photosensitive surface; developer substantially filling said space between said conductive wall and said photosensitive surface for developing said latent image; the spacing between said electrode and said photosensitive surface being of such dimension to allow excessive developer to pass thereinto and to freely fall therethrough into said sump; and means for moving said photosensitive surface in the direction of developer flow at a speed which is faster than the flow of the developer from the space between said conductive wall and said photosensitive surface into said space between said electrode and said photosensitive surface whereby said latent image is developed as said photosensitive surface moves past said conductive wall.
Claim 2
Dependent Claim
216 words
In a xerographic copying apparatus; a rotatable member having a photosensitive surface thereon; an electrostatic latent image on said surface, means developing said latent image; said developing means comprising: a conductive wall spaced from said photosensitive surface, an electrode connected to said conductive wall at the lower end thereof and spaced from said photosensitive surface at a distance which is less than the spacing therefrom of said conductive wall, and insulating means located between said conductive wall and said electrode to electrically separate the same; a developer sump containing developer therein; means for delivering developer from said sump to the space between said conductive wall and said photosensitive surface; developer substantially filling said space between said conductive wall and said photosensitive surface for developing said latent image; the spacing between said electrode and said photosensitive surface being of such dimension to allow excessive developer to pass thereinto and to freely fall therethrough into said sump; and means for moving said photosensitive surface in the direction of developer flow at a speed which is faster than the flow of the developer from the space between said conductive wall and said photosensitive surface into said space between said electrode and said photosensitive surface whereby said latent image is developed as said photosensitive surface moves past said conductive wall.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 further including means for supplying independent voltages to said conductive wall and second electrodes.
Claim 4
Dependent Claim
30 words
The apparatus of claim 1 further including a wire mesh located in the space between said conductive wall and the photosensitive surface and means for applying an electrical voltage thereto.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |