US4220698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct imaging pressure fixable magnetic toners
Assignee: Reprographic Materials Inc
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Filing: 1978-12-20
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Granted: 1980-09-02
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Expires: 1998-12-20
Abstract
Abstract Novel pressure fixable direct imaging magnetic toners having a core of magnetic material held together with an adhesive resin, a barrier substantially covering the core, an overcoat of thermoplastic strengthening resin, and an outer conductive layer, together with novel processes for producing such toners, these processes comprising dispersion of the core material followed by agglomeration of the several layers in a single aqueous medium.
Inventors
- 👤 Carl Brynko
- 👤 Carl G. Brynko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; G03G9/083; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A direct imaging, pressure fixable particulate magnetic toner, the particles of which successively comprise a core of magnetic material and a pressure-sensitive resin, a substantially continuous barrier coat which encloses and shields the core from the remainder of the particle, a pressure friable resin overcoating said barrier coat and providing strength to the particles, and an electrically conductive outer layer.
Claim 2
Dependent Claim
60 words
A direct imaging, pressure fixable particulate magnetic toner, the particles of which successively comprise a core of magnetic material and a pressure-sensitive resin, a substantially continuous barrier coat which encloses and shields the core from the remainder of the particle, a pressure friable resin overcoating said barrier coat and providing strength to the particles, and an electrically conductive outer layer.
Claim 3
Dependent Claim
21 words
A toner according to claim 1 wherein the outer layer has a conductivity of from 10 -2 to 10 -10 mho/centimeter.
Claim 4
Dependent Claim
12 words
A toner according to claim 1 wherein the magnetic material is magnetite.
Claim 5
Dependent Claim
16 words
A toner according to claim 1 wherein the particle size is from 3 to 35 micrometers.
References Cited (Backward Citations)
US3745118A
Cited
US3965022A
Cited
US3925217A
Cited
US4137188A
Cited
US4108786A
Cited
US4133774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |