US3965478A
Expired / Lapsed
US
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Multicolor magnetographic printing system
Assignee: Raytheon Co
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Filing: 1974-12-09
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Granted: 1976-06-22
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Expires: 1994-12-09
Abstract
Abstract A multicolor magnetographic printing system wherein a magnetizable surface is recorded upon with a different recording wavelength for each color to be printed. Toner is supplied which includes a mixture of different types of particles, each having a different color. The differently colored particles each maximally adhere only to areas on the surface recorded at a wavelength specific for the particular particle type. The toner particles are varied in magnetic susceptibility as well as linear dimensions so as to adjust their maximum adherence for the particularly matched wavelength. Such a system may further include an image enhancement system to ensure that the proper toner particles are concentrated in the appropriate areas. The toner is transferred to a paper surface by both preheating the paper before transfer and heating it afterwards to fix the toner onto the paper surface.
Inventors
- 👤 Ernst F. R. A. Schloemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:13
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
55 words
A color magnetographic printing system comprising in combination: means for magnetizing a magnetizable surface with a plurality of recording wavelengths; and a plurality of toner types, particles of each of said toner types adhering maximally to areas of said surface magnetized at a predetermined wavelength, each of said toner types corresponding to a predetermined color.
Claim 2
Dependent Claim
55 words
A color magnetographic printing system comprising in combination: means for magnetizing a magnetizable surface with a plurality of recording wavelengths; and a plurality of toner types, particles of each of said toner types adhering maximally to areas of said surface magnetized at a predetermined wavelength, each of said toner types corresponding to a predetermined color.
Claim 3
Dependent Claim
13 words
The combination of claim 1 wherein said magnetizable surface comprises a magnetizable belt.
Claim 4
Dependent Claim
13 words
The combination of claim 1 wherein said magnetizable surface comprises a magnetizable drum.
Claim 5
Dependent Claim
16 words
The combination of claim 1 wherein at least some of said toner particles are different colors.
Claim 6
Dependent Claim
39 words
The combination of claim 4 wherein at least some of said toner types comprise a plurality of particles, said particles each having a central core of magnetizable material and a shell of non-magnetizable material, said shell surrounding said core.
Claim 7
Dependent Claim
14 words
The combination of claim 5 wherein said shell comprises a color bearing thermoplastic material.
Claim 8
Dependent Claim
13 words
The combination of claim 6 wherein said magnetizable material is not permanently magnetizable.
Claim 9
Dependent Claim
33 words
The combination of claim 4 wherein at least some of said toner types comprise a plurality of particles, said particles being a substantially homogeneous mixture of a magnetizable material and a non-magnetizable material.
Claim 10
Dependent Claim
15 words
The combination of claim 8 wherein said non-magnetizable material comprises a color bearing thermoplastic material.
Claim 11
Dependent Claim
16 words
The combination of claim 4 wherein said magnetizable surface is magnetized in a plurality of patterns.
Claim 12
Dependent Claim
13 words
The combination of claim 10 wherein said patterns represent characters to be printed.
Claim 13
Dependent Claim
34 words
The combination of claim 10 wherein said patterns each comprise a plurality of areas within each of which the direction of magnetization of said surface alternates along at least one direction on said surface.
Claim 14
Dependent Claim
19 words
The combination of claim 12 wherein the direction of said magnetization is varied in accordance with a recording wavelength.
Claim 15
Dependent Claim
18 words
The combination of claim 13 wherein said recording wavelength is varied among at least some of said patterns.
Claim 16
Dependent Claim
22 words
The combination of claim 14 wherein the area to which each of said toner types adhere is dependent upon said recording wavelength.
Claim 17
Dependent Claim
13 words
The combination of claim 15 wherein said patterns comprise characters to be printed.
Claim 18
Dependent Claim
41 words
The combination of claim 16 further comprising: means for magnetizing said magnetizable surface in said patterns; means for applying said plurality of toner types to said surface; and means for transferring said toner types from said surface to a paper surface.
Claim 19
Dependent Claim
25 words
The combination of claim 17 further comprising means from removing said toner from areas of said surface which have not been magnetized in said patterns.
Claim 20
Dependent Claim
42 words
The combination of claim 18 wherein said toner removing means comprises in combination: ultrasonic transducer means, said transducer means being located in proximity to said surface; and means for randomly deflecting toner particles dislodged from said surface by said ultrasonic transducer means.
Claim 21
Dependent Claim
76 words
A color magnetographic printing system comprising in combination: means for magnetizing a magnetizable surface at a plurality of wavelengths; and a plurality of toner types, particles of each of said toner types adhering maximally to areas of said surface which have been magnetized at a predetermined wavelength specific to that toner type, said predetermined wavelength being different for at least some of said toner types, and each of said toner types corresponding to a predetermined color.
Claim 22
Dependent Claim
76 words
A color magnetographic printing system comprising in combination: means for magnetizing a magnetizable surface at a plurality of wavelengths; and a plurality of toner types, particles of each of said toner types adhering maximally to areas of said surface which have been magnetized at a predetermined wavelength specific to that toner type, said predetermined wavelength being different for at least some of said toner types, and each of said toner types corresponding to a predetermined color.
Claim 23
Dependent Claim
17 words
The combination of claim 20 wherein at least some of siad toner types are of different colors.
Claim 24
Dependent Claim
17 words
The combination of claim 21 wherein at least some of said toner types are of different weights.
Claim 25
Dependent Claim
18 words
The combination of claim 21 herein at least some of said toner types are of different magnetic permeability.
Claim 26
Dependent Claim
79 words
A color magnetographic printing system comprising in combination: means for providing a magnetizable surface; and means for magnetizing portions of said surface in a plurality of patterns, each of said patterns comprising magnetized regions of said surface in which the direction of magnetization of said surface is periodically varied at predetermined recording wavelengths, the recording wavelengths varying between at least some of said patterns in accordance with a color with which each of said patterns is to be printed.
Claim 27
Dependent Claim
79 words
A color magnetographic printing system comprising in combination: means for providing a magnetizable surface; and means for magnetizing portions of said surface in a plurality of patterns, each of said patterns comprising magnetized regions of said surface in which the direction of magnetization of said surface is periodically varied at predetermined recording wavelengths, the recording wavelengths varying between at least some of said patterns in accordance with a color with which each of said patterns is to be printed.
Claim 28
Dependent Claim
64 words
The combination of claim 24 wherein said magnetizing means comprises: a plurality of recording heads, each of said heads producing a recording track; means for selectively coupling each of said recording heads to one of at least two oscillator sources, said sources each having a different frequency; and means for selecting to which of said oscillator sources each of said recording channels is coupled.
Claim 29
Dependent Claim
19 words
The combination of claim 25 wherein said selecting means is operated in response to character patterns to be printed.
Claim 30
Dependent Claim
18 words
The combination of claim 26 further comprising means for moving said magnetizable surface relative to said recording head.
Claim 31
Dependent Claim
89 words
A multicolor magnetographic printing method comprising the steps of: magnetizing at least some areas of a magnetizable surface with a first recording wavelength; magnetizing other areas of said magnetizable surface with other recording wavelengths; applying a plurality of differently colored toner particle types to said magnetizable surface, each one of said toner particle types adhering maximally to areas of said magnetizable surface magnetized with a recording wavelength specific for that toner particle type; and transferring said toner particles in recorded areas from said magnetizable surface to a paper surface.
Claim 32
Dependent Claim
89 words
A multicolor magnetographic printing method comprising the steps of: magnetizing at least some areas of a magnetizable surface with a first recording wavelength; magnetizing other areas of said magnetizable surface with other recording wavelengths; applying a plurality of differently colored toner particle types to said magnetizable surface, each one of said toner particle types adhering maximally to areas of said magnetizable surface magnetized with a recording wavelength specific for that toner particle type; and transferring said toner particles in recorded areas from said magnetizable surface to a paper surface.
Claim 33
Dependent Claim
32 words
The method of claim 28 further comprising the step of removing toner particles which are not located in a recorded area from said magnetizable surface before transfer is made to said paper.
Claim 34
Dependent Claim
26 words
The method of claim 29 further comprising the step of heating said toner particles to at least melting temperature after transfer is made to said paper.
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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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |