US3598993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging apparatus using a magnetizable printing ink with a temperature dependent magnetic permeability
Assignee: Agfa Gevaert NV
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Filing: 1969-03-06
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Granted: 1971-08-10
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Expires: 1989-03-06
Abstract
Abstract An image is formed by utilizing the temperature dependency of the magnetic permeability of a magnetizable material, in a device which comprises an image carrier carrying an image to be reproduced, a composite sheet including a layer comprising magnetizable material the magnetic permeability of which depends upon the extent of heating of such magnetizable material, a transporting arrangement for concurrently moving the image carrier and the composite sheet in superposed relationship adjacent to each other, a source of heat for selectively heating the composite sheet, while in such superposed relationship, corresponding to the image on the image carrier so that on the composite sheet a selective pattern of portions of the magnetizable material having a predetermined magnetic permeability range will be formed, which portions will correspond to the image on the image carrier, and a source of magnetic force located downstream of the heat source in the direction of movement of the composite sheet so that magnetic force will be exerted on the portions of the magnetizable material forming the selective pattern of predetermined permeability range.
Inventors
- 👤 Helmut Kaufer
- 👤 Erich Burger
- 👤 Hans-Peter Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:58
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
270 words
A device for forming an image by utilizing the temperature dependency of the magnetic permeability of a magnetizable printing ink, comprising, in combination, an image carrier carrying an image to be reproduced; sheet means including two superposed layers removably adhering to each other, one of said layers being formed at its face adjacent to the other of said layers with indentations holding magnetizable printing ink at the portions thereof which are spaced from the other of said layers, said magnetizable printing ink having a magnetic permeability which depends upon the extent of heating of the same and being capable of being dislocated by magnetic force, the other Of said layers closing the indentations in said face of said one layer; moving means for concurrently moving said image carrier and said sheet means in superposed relationship adjacent to each other; heating means for selectively heating said sheet means, while in said superposed relationship, corresponding to said image so as to form on said sheet means a selective pattern of portions of said magnetizable ink having a predetermined magnetic permeability range which portions correspond to said image; and magnetic means located downstream of said heating means in the direction of movement of said sheet means and facing the other of said layers for exertion of magnetic force on the portions of said magnetizable ink forming said selective pattern of predetermined permeability range, whereby upon passage of said sheet means along said magnetic means the portions of said magnetic ink forming said selective pattern will be drawn towards said magnetic means and thereby deposited at the inwardly directed face of said other layer.
Claim 2
Independent Claim
270 words
A device for forming an image by utilizing the temperature dependency of the magnetic permeability of a magnetizable printing ink, comprising, in combination, an image carrier carrying an image to be reproduced; sheet means including two superposed layers removably adhering to each other, one of said layers being formed at its face adjacent to the other of said layers with indentations holding magnetizable printing ink at the portions thereof which are spaced from the other of said layers, said magnetizable printing ink having a magnetic permeability which depends upon the extent of heating of the same and being capable of being dislocated by magnetic force, the other Of said layers closing the indentations in said face of said one layer; moving means for concurrently moving said image carrier and said sheet means in superposed relationship adjacent to each other; heating means for selectively heating said sheet means, while in said superposed relationship, corresponding to said image so as to form on said sheet means a selective pattern of portions of said magnetizable ink having a predetermined magnetic permeability range which portions correspond to said image; and magnetic means located downstream of said heating means in the direction of movement of said sheet means and facing the other of said layers for exertion of magnetic force on the portions of said magnetizable ink forming said selective pattern of predetermined permeability range, whereby upon passage of said sheet means along said magnetic means the portions of said magnetic ink forming said selective pattern will be drawn towards said magnetic means and thereby deposited at the inwardly directed face of said other layer.
Claim 3
Dependent Claim
23 words
A device as defined in claim 1, wherein said moving means move said image carrier and said sheet means along a straight path.
Claim 4
Dependent Claim
26 words
A device as defined in claim 1, wherein said magnetic means comprise an elongated magnetic bar including opposite magnetic poles arranged immediately adjacent to each other.
Claim 5
Dependent Claim
21 words
A device as defined in claim 1, wherein said magnetic means comprise an elongated arrangement of a plurality of magnetic coils.
Claim 6
Dependent Claim
23 words
A device as defined in claim 4, wherein the magnetic characteristics of the coil of the plurality of magnetic coils are individually controllable.
Claim 7
Dependent Claim
17 words
A device as defined in claim 1, wherein said moving means include a driven rotatable transport roller.
Claim 8
Dependent Claim
60 words
A device as defined in claim 1, wherein said moving means include a driven rotatable transport roller, and driving means for rotating said transport roller about its axis, said driving means comprising an adjustable motor so that the rotational speed of said transport roller and thereby the forward speed of said superposed image carrier and sheet means may be adjusted.
Claim 9
Dependent Claim
37 words
A device as defined in claim 1, wherein said other of said sheets is opaque so that as long as said magnetizable material in said indentations is spaced from said other sheet it cannot be seen therethrough.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |