US4229512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toners for color flash fusers containing a permanent colorant and a heat sensitive dye
Assignee: Xerox Corp
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Filing: 1978-10-06
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Granted: 1980-10-21
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Expires: 1998-10-06
Abstract
Abstract A toner and imaging system wherein the utilized toner is composed of a permanent colorant of the final color desired and additionally contains heat sensitive dye that darkens the color of the toner so that it more efficiently absorbs heat during flash fusing but then decomposes, becoming colorless, to leave an image the color of the permanent colorant.
Inventors
- 👤 Myron J. Lenhard
- 👤 James D. Rees
- 👤 Xerox Corporation
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/0916; G03G9/0924; G03G9/0926
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
40 words
Electrostatographic toner particles for utilization in flash fusing systems, such particles being comprised of resins, permanent colorant, and heat sensitive and light sensitive dye, wherein the dyes upon heating, and upon exposure to light decomposes to form substantially colorless products.
Claim 2
Dependent Claim
40 words
Electrostatographic toner particles for utilization in flash fusing systems, such particles being comprised of resins, permanent colorant, and heat sensitive and light sensitive dye, wherein the dyes upon heating, and upon exposure to light decomposes to form substantially colorless products.
Claim 3
Dependent Claim
72 words
An electrostatographic toner in accordance with claim 1 wherein the dye employed is of the following structure ##STR3## wherein Q represents non-metallic atoms necessary to complete a sensitizing or desensitizing nucleus containing 5 or 6 carbon atoms in the heterocyclic ring, R is an alkyl radical, or an acyl radical, and R 1 is a hydrogen atom, or an alkyl group of 1 to 4 carbon atoms, and X is an anion.
Claim 4
Dependent Claim
26 words
The toner of claim 1 wherein said heat sensitive dye is selected from the group comprising 1-ethoxy-3'-ethyl-2-pyridothiacyanine tetrafluoroborate, 3'-ethyl-1-methoxy-2-pyridothiacarbocyanine perchlorate, 3'-ethyl-1-methoxy 4',5'-benzo-2-pyridothiacarbocyanine tetrafluoroborate and mixtures thereof.
Claim 5
Dependent Claim
38 words
The toner of claim 1 wherein said permanent colorant comprises one of cyan, magenta or yellow and said heat sensitive dye is comprised of a mixture of the remaining two colors of the cyan, magenta and yellow group.
Claim 6
Dependent Claim
12 words
The toner of claim 1 wherein said heat sensitive dye is black.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |