US4288516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resin containing magnetic toner material and process for its use in flash fuser
Assignee: Xerox Corp
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Filing: 1980-01-28
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Granted: 1981-09-08
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Expires: 2000-01-28
Abstract
Abstract A new magnetic toner comprising a magnetic material and a resin comprising a polymeric esterification product of a dicarboxylic acid and a diol comprising a diphenol is disclosed. This toner is particularly useful in flash fusing systems.
Inventors
- 👤 Stephen L. Gaudioso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:06
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/083; G03G9/0831; G03G9/0833; G03G9/0832; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A single component magnetic toner comprised of from about 25 percent to about 50 percent by weight of a resin which is selected from the polymeric esterification condensation products of 2,2 bis (4-hydroxy-isopropoxy-phenyl)-propane and fumaric acid, 2,2 bis (4-hydroxy-isopropoxy-phenyl)-propane and 2,2-dimethyl fumaric acid, 2,2 bis (4-hydroxy-butoxy-phenyl)-propane and fumaric acid, 2,2 bis (4-hydroxy-butoxy-phenyl)-propane and 2,2-dimethyl fumaric acid, or 2,2 bis (4-hydroxy-ethoxy phenyl)-propane and fumaric acid, and from about 50 percent to about 75 percent of magnetite.
Claim 2
Dependent Claim
75 words
A single component magnetic toner comprised of from about 25 percent to about 50 percent by weight of a resin which is selected from the polymeric esterification condensation products of 2,2 bis (4-hydroxy-isopropoxy-phenyl)-propane and fumaric acid, 2,2 bis (4-hydroxy-isopropoxy-phenyl)-propane and 2,2-dimethyl fumaric acid, 2,2 bis (4-hydroxy-butoxy-phenyl)-propane and fumaric acid, 2,2 bis (4-hydroxy-butoxy-phenyl)-propane and 2,2-dimethyl fumaric acid, or 2,2 bis (4-hydroxy-ethoxy phenyl)-propane and fumaric acid, and from about 50 percent to about 75 percent of magnetite.
Claim 3
Dependent Claim
21 words
A magnetic toner in accordance with claim 1 wherein the magnetite is present in an amount of 65 percent by weight.
Claim 4
Dependent Claim
13 words
A magnetic toner according to claim 1 wherein said magnetite is Mapico Black.
Claim 5
Dependent Claim
17 words
A magnetic toner according to claim 1 wherein about 65% by weight of Mapico Black is present.
Claim 6
Dependent Claim
12 words
A magnetic toner according to claim 1 further including a flow agent.
Claim 7
Dependent Claim
14 words
A magnetic toner according to claim 1 wherein said flow agent comprises Silanox 101.
Claim 8
Dependent Claim
22 words
A magnetic toner according to claim 1 wherein the toner particles range in size from about 3 microns to about 20 microns.
Claim 9
Dependent Claim
22 words
A magnetic toner according to claim 1 wherein the toner particles range in size from about 5 microns to about 12 microns.
Claim 10
Dependent Claim
22 words
A magnetic toner according to claim 1 wherein the toner particles range in size from about 6 microns to about 9 microns.
Claim 11
Dependent Claim
25 words
A magnetic toner in accordance with claim 1 wherein the pile height of the unfused toner ranges from about 6 millimicrons to about 30 millimicrons.
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |