US3965862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic development system
Assignee: Xerox Corp
•
Filing: 1975-01-30
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Granted: 1976-06-29
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Expires: 1995-01-30
Abstract
Abstract An apparatus for developing a latent image on a charged photosensitive surface of a xerography printing machine has a magnetic brush assembly including a donor roll and a cleaning electrode adjacent to the roll for reducing the accumulation of toner particles as a coating on the roll surface.
Inventors
- 👤 Frank Yang
- 👤 Jerome E. Lamel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
An apparatus for developing a latent image on a charged photoconductive surface wherein the potential in the area of the image is higher than that of the remainder of the said surface comprising a sump containing developer material comprising toner particles triboelectrically attracted to magnetic carrier granules, a rotatable magnetic applicator means disposed in the sump for applying toner particles to the photoconductive surface, said applicator means being electrically biased at a potential intermediate the potential in the area of the image and remaining areas of the said surface, and a stationary bar disposed in spaced substantially parallel relationship with the surface of said magnetic applicator means and extending throughout the length thereof, said bar being electrically biased to a potential greater than that on the applicator means but less than the potential of the latent image on the said photoconductive surface and said bar is disposed upstream of the photoconductive surface in the rotating path of the applicator means.
Claim 2
Independent Claim
160 words
An apparatus for developing a latent image on a charged photoconductive surface wherein the potential in the area of the image is higher than that of the remainder of the said surface comprising a sump containing developer material comprising toner particles triboelectrically attracted to magnetic carrier granules, a rotatable magnetic applicator means disposed in the sump for applying toner particles to the photoconductive surface, said applicator means being electrically biased at a potential intermediate the potential in the area of the image and remaining areas of the said surface, and a stationary bar disposed in spaced substantially parallel relationship with the surface of said magnetic applicator means and extending throughout the length thereof, said bar being electrically biased to a potential greater than that on the applicator means but less than the potential of the latent image on the said photoconductive surface and said bar is disposed upstream of the photoconductive surface in the rotating path of the applicator means.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 comprising three separate sumps each having a transport means for developing multi-color images.
Claim 4
Dependent Claim
30 words
The apparatus of claim 1 wherein the rod is biased at a potential of about 800 volts and the applicator means is biased at a potential of about 500 volts.
Claim 5
Dependent Claim
55 words
The apparatus of claim 1 wherein the applicator means comprises a donor roll rotatable in a magnetic field and said apparatus comprises a rotatable paddle wheel in the sump, a transport roll for moving developer material towards the donor roll, and a means for trimming toner material from about the surface of the transport roll.
Claim 6
Dependent Claim
30 words
The apparatus of claim 4 wherein the spacing between the said trimming means and the transport roll and the spacing between the electrode and developer roll are substantially the same.
References Cited (Backward Citations)
US3316879A
Cited
US3645770A
Cited
US3580673A
Cited
US3854449A
Cited
US3795222A
Cited
US3882823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |