Patent US4207101A successfully refreshed from Google Patents.
US4207101A
Expired / Lapsed
US
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Process for magnetically transferring a powder image
Assignee: Canon Production Printing Holding BV
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Filing: 1978-07-06
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Granted: 1980-06-10
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Expires: 1998-07-06
Abstract
Abstract Transfer of a powder image from a material carrying the image, such as a photoconductive material utilized for indirect electrophotographic copying, is effected magnetically by employing magnetically attractable developing powder for forming the image and bringing the powder image while under the influence of a magnetic field into contact with a first receiving support that comprises a myriad of zones of a first material which are separated from each other by a second material, one of these materials being magnetizable and the other being not magnetizable. The materials preferably are metals giving the first receiving support a durable smooth surface. The zones of the first material have a diameter and inter-distance of, at most, about 5 times and preferably about 1 to 2 times the diameter of the largest powder particles to be transferred, so usually of about 50 to 100 microns. After being transferred magnetically to the first receiving support the powder image is transferred from it, directly or indirectly, to a final receiving support which usually is plain copy paper.
Inventors
- 👤 Mathias J. J. M. Vola
- 👤 Willem T. Draai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:57
CPC Classifications
G; G03; G03G; G03G19/00; G03G15/00; G03G15/14; G03G15/16; G03G15/1605
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
In a process for transferring a powder image formed of magnetically attractable developing powder, in which the powder image under influence of a magnetic field is transferred magnetically to a first receiving support and is subsequently transferred directly or indirectly from said first receiving support to a final receiving support, the improvement comprising that the first receiving support comprises a myriad of zones of a first material separated from each other by a second material, one of the said materials being magnetizable and the other of them being not magnetizable.
Claim 2
Dependent Claim
90 words
In a process for transferring a powder image formed of magnetically attractable developing powder, in which the powder image under influence of a magnetic field is transferred magnetically to a first receiving support and is subsequently transferred directly or indirectly from said first receiving support to a final receiving support, the improvement comprising that the first receiving support comprises a myriad of zones of a first material separated from each other by a second material, one of the said materials being magnetizable and the other of them being not magnetizable.
Claim 3
Dependent Claim
15 words
A process according to claim 1, said zones having a substantially square or round shape.
Claim 4
Dependent Claim
47 words
A process according to claim 1 or 2, the greatest diameter of said zones and also the greatest inter-distance between them lying between the diameter of the smallest powder particles of the powder image and at most five times the diameter of the largest powder particles thereof.
Claim 5
Dependent Claim
28 words
A process according to claim 1 or 2, the greatest diameter of said zones and also the greatest inter-distance between them amounting to about 50 to 100 micrometers.
Claim 6
Dependent Claim
22 words
A process according to claim 1 or 2, said zones collectively covering 30-70% of the surface area of the first receiving support.
Claim 7
Dependent Claim
34 words
A process according to claim 1 or 2, each of the said materials being a metal or a metal alloy, and said materials together providing said first receiving support with a smooth, metallic surface.
Claim 8
Dependent Claim
25 words
A process according to claim 1 or 2, said one material being a permanently magnetizable material having a remanent magnetism of at least 2 kA/m.
Claim 9
Dependent Claim
122 words
In a process for transferring a powder image formed of magnetically attractable developing powder, in which the powder image under influence of a magnetic field is transferred magnetically to a first receiving support and is subsequently transferred directly or indirectly from said first receiving support to a final receiving support, the improvement comprising that said first receiving support has a smooth metallic surface formed by a myriad of zones of magnetizable metal or metal alloy separated from each other by non-magnetizable metal or metal alloy, said zones having a substantially square or round shape and occupying 30 to 70% of the area of said surface and their greatest diameter and the greatest distance between them amounting to between 5 and 250 microns.
Claim 10
Dependent Claim
122 words
In a process for transferring a powder image formed of magnetically attractable developing powder, in which the powder image under influence of a magnetic field is transferred magnetically to a first receiving support and is subsequently transferred directly or indirectly from said first receiving support to a final receiving support, the improvement comprising that said first receiving support has a smooth metallic surface formed by a myriad of zones of magnetizable metal or metal alloy separated from each other by non-magnetizable metal or metal alloy, said zones having a substantially square or round shape and occupying 30 to 70% of the area of said surface and their greatest diameter and the greatest distance between them amounting to between 5 and 250 microns.
Claim 11
Dependent Claim
50 words
A process according to claim 8, said zones being formed of permanently magnetizable metal or alloy having a remanent magnetism of at least 2 kA/m, and transfer of the powder image to said first receiving support being effected by contacting the latter with the powder image under slight contact pressure.
Claim 12
Dependent Claim
59 words
A process according to claim 8, said powder image being formed of permanently magnetizable powder particles and said zones being formed of non-permanently magnetizable metal or metal alloy, and transfer of the powder image to said first receiving support being effected by contacting the latter with the powder image under slight contact pressure with said image in magnetized state.
Claim 13
Dependent Claim
74 words
In an electrophotographic process in which a latent electrostatic image is formed in a photoconductive material, the latent image is developed with a magnetically attractable developing powder and the resultant powder image under influence of a magnetic field is transferred magnetically from the photoconductive material to a receiving support, the improvement comprising that the magnetic transfer of the powder image is effected by a process according to claim 1, claim 9, or claim 10.
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |