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Patent US4623602A successfully refreshed from Google Patents.
US4623602A
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Magnetically attractable color toner powder
Assignee: Canon Production Printing Netherlands BV
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Filing: 1985-02-19
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Granted: 1986-11-18
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Expires: 2005-02-19
Abstract
Abstract A colored magnetically attractable toner powder in which the individual toner particles comprise a core containing magnetically attractable material, a light-reflecting layer which envelops the core and comprises light-reflecting pigment, yellow-fluorescent dye and a binder in which the dye fluoresces, and a coloring layer which covers the light-reflecting layer and comprises yellow-fluorescent dye, optionally in an admixture with other fluorescent dye or dyes or pigments, and a binder in which the fluorescent dye or dyes fluoresce(s).
Inventors
- 👤 Martin Bakker
- 👤 Johannes A. H. Van Laarhoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0926; G03G9/0825; G03G9/083; G03G9/0902; G03G9/0906; G03G9/091; G03G9/0914; G03G9/0916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
In colored magnetically attractable toner powder, the individual particles of which comprise a core containing magnetically attractable material, a light-reflecting layer enveloping said core containing a binder and light-reflecting pigment, and a coloring layer covering said light-reflecting layer and containing a binder and non-yellow fluorescent dye, the improvement comprising in combination therewith a yellow-fluorescent dye added to said light-reflecting layer in an amount up to 10% by weight of the binder to obtain maximum light-reflection in the wavelength between 500 to 560 nm and to the coloring layer wherein said binder in both of said layers consists of a polymer in which said yellow-fluorescent dye fluoresces.
Claim 2
Dependent Claim
106 words
In colored magnetically attractable toner powder, the individual particles of which comprise a core containing magnetically attractable material, a light-reflecting layer enveloping said core containing a binder and light-reflecting pigment, and a coloring layer covering said light-reflecting layer and containing a binder and non-yellow fluorescent dye, the improvement comprising in combination therewith a yellow-fluorescent dye added to said light-reflecting layer in an amount up to 10% by weight of the binder to obtain maximum light-reflection in the wavelength between 500 to 560 nm and to the coloring layer wherein said binder in both of said layers consists of a polymer in which said yellow-fluorescent dye fluoresces.
Claim 3
Dependent Claim
34 words
A toner powder according to claim 1, wherein the content of said yellow-fluorescent dye in the light-reflecting layer is about 2.5 to 8.0 by weight based on the quantity of binder in said layer.
Claim 4
Dependent Claim
17 words
A toner powder according to claims 1 or 2, wherein said coloring layer also contains cyan pigment.
Claim 5
Dependent Claim
32 words
A toner powder according to claims 1 or 2, wherein the coloring layer also contains at least one other fluorescent dye which absorbs light in the fluorescence range of the yellow-fluorescent dye.
Claim 6
Dependent Claim
21 words
A toner powder according to claims 1 or 2, wherein said binder in both layers is a polymer bearing electronegative groups.
Claim 7
Dependent Claim
24 words
A toner powder according to claims 1 or 2, wherein each of said layers additionally contains a compound having at least one electronegative group.
Claim 8
Dependent Claim
20 words
A toner powder according to claim 6, wherein said compound bearing at least one electronegative group is an acid anhydride.
Claim 9
Dependent Claim
43 words
A toner powder according to claim 6, wherein the binder is epoxy resin, the epoxide groups of which have been partly blocked by a monofunctional reagent and partly cross-linked by intermolecular reaction and/or reaction with a bifunctional or polyfunctional reagent bearing electronegative groups.
References Cited (Backward Citations)
JPS5142539A
Cited
US4070577A
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US4238562A
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JPS5766441A
Cited
US4443527A
Cited
US4486523A
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |