Patent US3899693A successfully refreshed from Google Patents.
Patent US3592167A successfully refreshed from Google Patents.
US3592167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for loading toner on a developing brush
Assignee: Xerox Corp
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Filing: 1969-04-02
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Granted: 1971-07-13
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Expires: 1989-04-02
Abstract
Abstract A brush for developing electrostatic latent images having apertures which enable toner particles within the core of the brush to pass through the brush onto its outer periphery. The toner is held on the outer periphery of the brush by electrical charges until attracted to the latent image by electrostatic charges.
Inventors
- 👤 James H Blow Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0805
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
An apparatus for developing a latent electrostatic image on an insulating surface with finely divided toner particles comprising: a hollow, cylindrical frame capable of containing a quantity of toner particles and having an outer surface of brushlike material fastened thereto with brush fibers extending outwardly from the outer surface, apertures in the brushlike material and in the outer surface of the frame, said apertures being of a size sufficient to allow toner particles within the frame to pass through the outer surface to the fibers of the brushlike material, means to support the frame in a position whereby the brush fibers extend into contact with the insulating surface containing an electrostatic image, and means to rotate the frame whereby toner particles within the frame pass through the apertures in the outer surface to the fibers of the brushlike material and are brought into contact with the electrostatic image on the insulating surface.
Claim 2
Independent Claim
152 words
An apparatus for developing a latent electrostatic image on an insulating surface with finely divided toner particles comprising: a hollow, cylindrical frame capable of containing a quantity of toner particles and having an outer surface of brushlike material fastened thereto with brush fibers extending outwardly from the outer surface, apertures in the brushlike material and in the outer surface of the frame, said apertures being of a size sufficient to allow toner particles within the frame to pass through the outer surface to the fibers of the brushlike material, means to support the frame in a position whereby the brush fibers extend into contact with the insulating surface containing an electrostatic image, and means to rotate the frame whereby toner particles within the frame pass through the apertures in the outer surface to the fibers of the brushlike material and are brought into contact with the electrostatic image on the insulating surface.
Claim 3
Dependent Claim
67 words
The apparatus in claim 1 further including an intermediate layer of material between the frame and brushlike material and having apertures aligned with the apertures in the frame and brush material, said intermediate layer of material having triboelectric properties relative to the toner particles whereby the toner particles are triboelectrically charged by rubbing against the intermediate layer as they pass from the frame to the brushlike material.
Claim 4
Dependent Claim
52 words
The apparatus in claim 1 further including a plurality of mixing vanes attached to the frame and extending into the hollow portion of the frame, said vanes being of a material which has triboelectric properties, relative to the toner particles, whereby the toner particles are triboelectrically charged by contact with the vanes.
Claim 5
Dependent Claim
28 words
The apparatus in claim 1 further including means to generate air pressure within the frame to urge toner particles to pass through the apertures to the brushlike material.
Claim 6
Dependent Claim
99 words
The apparatus in claim 1 wherein the frame comprises alternate elements of conductive and relatively nonconductive material, and further including a means to impose an electric field on those conductive elements of the frame which are located other than immediately adjacent the insulating surface, the electric field having the characteristic of placing on those conductive elements a charge having the opposite polarity as the polarity of the toner particles whereby the toner particles on the surface of the brush material at positions other than in the vicinity of the insulating surface are urged to remain on the brushlike material.
Claim 7
Dependent Claim
42 words
The apparatus of claim 1 wherein the brushlike material comprises fur brush material having a backing pad with elongated carrier fibers protruding therefrom, and further including a housing surrounding the brush except that portion of the brush immediately adjacent the insulating plate.
Claim 8
Dependent Claim
52 words
The apparatus in claim 1 further including a quantity of carrier particles within the frame which are of grossly larger size than the toner particles and the apertures and comprise a material which has triboelectric properties relative to the toner particles to thereby triboelectrically charge the toner particles as the frame rotates.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |