US4240740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development system
Assignee: Xerox Corp
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Filing: 1979-06-11
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Granted: 1980-12-23
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Expires: 1999-06-11
Abstract
Abstract An apparatus which develops a latent image with magnetic particles. The apparatus includes a member having a multiplicity of magnetic fibers extending outwardly therefrom. At least a portion of the fibers have the free end regions thereof contacting the latent image. A magnet field attracts the particles to the member. Relative movement between the member and magnet field move the particles into contact with the latent image to form a substantially uniform particle image.
Inventors
- 👤 Eugene F. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:27
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
113 words
An apparatus for developing a latent image with magnetic particles, including: an elongated tubular member having a multiplicity of magnetic fibers extending outwardly therefrom with the free end regions of at least a portion of said fibers being positioned closely adjacent to the latent image; an elongated magnetic member disposed interiorly of said tubular member for generating a magnetic field to attract the particles to said tubular member; and means for producing relative movement between said tubular member and said magnetic member to move the particles attracted to said tubular member into contact with the latent image so that the particles being deposited on the latent image form a substantially uniform particle image.
Claim 2
Independent Claim
113 words
An apparatus for developing a latent image with magnetic particles, including: an elongated tubular member having a multiplicity of magnetic fibers extending outwardly therefrom with the free end regions of at least a portion of said fibers being positioned closely adjacent to the latent image; an elongated magnetic member disposed interiorly of said tubular member for generating a magnetic field to attract the particles to said tubular member; and means for producing relative movement between said tubular member and said magnetic member to move the particles attracted to said tubular member into contact with the latent image so that the particles being deposited on the latent image form a substantially uniform particle image.
Claim 3
Dependent Claim
31 words
An apparatus as recited in claim 1, wherein said fibers are grouped together to form a multiplicity of spaced tufts with each of said tufts having a multiplicity of said fibers.
Claim 4
Dependent Claim
22 words
An apparatus as recited in claim 2, further including a fabric secured to said tubular member and having said tufts woven therethrough.
Claim 5
Dependent Claim
14 words
An apparatus as recited in claim 3, wherein said fabric includes a conductive coating.
Claim 6
Dependent Claim
22 words
An apparatus as recited in claim 4, wherein each of said tufts include from about 500 to about 1500 of said fibers.
Claim 7
Dependent Claim
21 words
An apparatus as recited in claim 4, wherein said fabric includes from about 8 to about 28 tufts per square cm.
Claim 8
Dependent Claim
22 words
An apparatus as recited in claim 4, wherein each of said fibers range in thickness from about 0.005 to about 0.015 millimeters.
Claim 9
Dependent Claim
20 words
An apparatus as recited in claim 2, wherein said tufts are disposed on the circumferential surface of said tubular member.
Claim 10
Dependent Claim
23 words
An apparatus as recited in claim 8, wherein said producing means includes means for rotating said magnetic member relative to said tubular member.
Claim 11
Dependent Claim
15 words
An apparatus as recited in claim 2, wherein said fibers have substantially similar magnetic properties.
Claim 12
Dependent Claim
16 words
An apparatus as recited in claim 2, wherein said fibers are made preferably from stainless steel.
Claim 13
Dependent Claim
129 words
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed with magnetic particles, wherein the improvement includes; an elongated tubular member having a multiplicity of magnetic fibers extending outwardly therefrom with the free end regions of at least a portion of said fibers being positioned closely adjacent to the latent image; an elongated magnetic member disposed interiorly of said tubular member for generating a magnetic field to attract the particles to said tubular member; and means for producing relative movement between said tubular member and said magnetic member to move the particles attracted to said tubular member into contact with the latent image so that the particles being deposited on the latent image form a substantially uniform particle image.
Claim 14
Dependent Claim
129 words
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed with magnetic particles, wherein the improvement includes; an elongated tubular member having a multiplicity of magnetic fibers extending outwardly therefrom with the free end regions of at least a portion of said fibers being positioned closely adjacent to the latent image; an elongated magnetic member disposed interiorly of said tubular member for generating a magnetic field to attract the particles to said tubular member; and means for producing relative movement between said tubular member and said magnetic member to move the particles attracted to said tubular member into contact with the latent image so that the particles being deposited on the latent image form a substantially uniform particle image.
Claim 15
Dependent Claim
32 words
A printing machine as recited in claim 12, wherein said fibers are grouped together to form a multiplicity of spaced tufts with each of said tufts having a multiplicity of said fibers.
Claim 16
Dependent Claim
23 words
A printing machine as recited in claim 13, further including a fabric secured to said tubular member and having said tufts woven therethrough.
Claim 17
Dependent Claim
15 words
A printing machine as recited in claim 14, wherein said fabric includes a conductive coating.
Claim 18
Dependent Claim
23 words
A printing machine as recited in claim 14, wherein each of said tufts include from about 500 to about 1500 of said fibers.
Claim 19
Dependent Claim
22 words
A printing machine as recited in claim 14, wherein said fabric includes from about 8 to about 28 tufts per square cm.
Claim 20
Dependent Claim
23 words
A printing machine as recited in claim 14, wherein each of said fibers range in thickness from about 0.005 to about 0.015 millimeters.
Claim 21
Dependent Claim
21 words
A printing machine as recited in claim 13, wherein said fibers are disposed on the circumferential surface of said tubular member.
Claim 22
Dependent Claim
24 words
A printing machine as recited in claim 13, wherein said producing means includes means for rotating said magnetic member relative to said tubular member.
Claim 23
Dependent Claim
16 words
A printing machine as recited in claim 13, wherein said fibers have substantially similar magnetic properties.
Claim 24
Dependent Claim
17 words
A printing machine as recited in claim 21, wherein said fibers are made preferably from stainless steel.
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) | 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 |