Patent US4240723A successfully refreshed from Google Patents.
US4240723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electrographic image production and an apparatus for carrying out this process
Assignee: Elfotec AG
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Filing: 1975-05-16
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Granted: 1980-12-23
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Expires: 1995-05-16
Abstract
Abstract A process for a latent electrostatic image or a conductivity image on a photoconductor, a single-component magnetic toner being used for development and a magnetic brush being used not only for application of the toner to the image, but also for removal of residual toner. The brush may be one and the same brush for both tasks or separate brushes identical in structure may be used for each of the two tasks.
Inventors
- 👤 Gabor Forgo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:18
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0047; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0914; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A process for electrographic image production, in which a latent image on an intermediate image carrier capable of being developed with a toner is developed with a one component toner and said intermediate image carrier is cleaned, comprising both developing the latent image on the intermediate image carrier and also cleaning the intermediate image carrier with at least one magnetic brush in the absence of applied voltage, wherein a magnetic one-component toner comprising a core of at least magnetizable material covered by a layer of only limited conductivity is used to form the brush-form coating on the magnetic brush.
Claim 2
Dependent Claim
99 words
A process for electrographic image production, in which a latent image on an intermediate image carrier capable of being developed with a toner is developed with a one component toner and said intermediate image carrier is cleaned, comprising both developing the latent image on the intermediate image carrier and also cleaning the intermediate image carrier with at least one magnetic brush in the absence of applied voltage, wherein a magnetic one-component toner comprising a core of at least magnetizable material covered by a layer of only limited conductivity is used to form the brush-form coating on the magnetic brush.
Claim 3
Dependent Claim
65 words
A process as claimed in claim 1, wherein the development of the latent image on the intermediate image carrier capable of being developed with a toner and the subsequent cleaning of the intermediate image carrier of toner residues are carried out with one and the same magnetic brush, wherein the said magnetic one-component toner is used to form the brush-form coating on the magnetic brush.
Claim 4
Dependent Claim
72 words
An apparatus for carrying out the process according to claim 1, wherein at least one magnetic brush (14,25), includes a brush-like coating (14',25') comprising a magnetic one-component toner comprising a core of at least magnetizable material covered by a layer of only limited conductivity is provided for developing a latent image on an intermediate carrier and for removing toner residues from the intermediate image carrier, both in the absence of applied voltage.
Claim 5
Dependent Claim
72 words
An apparatus as described in claim 3, wherein two periodically interchangeable magnetic brushes having brush-like coatings comprising magnetic one-component toner comprising a core of at least magnetizable material covered by a layer of only limited conductivity are provided, one for developing the latent image on the intermediate carrier with said one-component toner and the other for removing toner residues from the intermediate image carrier, both operable in the absence of applied voltage.
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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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |