US4005022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic liquid toners
Assignee: Pitney Bowes Inc
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Filing: 1974-02-25
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Granted: 1977-01-25
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Expires: 1994-02-25
Abstract
Abstract Disclosed herein are novel liquid toner compositions that are suitable for developing electrostatic images. The toner compositions of the present invention comprise pigment, dye, and a polymer, the combination being suspended in an aliphatic saturated hydrocarbon. The improvement in the performance of these toners is due to the presence of small, but significant amounts of dyes which are capable of modifying the surface characteristics of the toner pigment particles.
Inventors
- 👤 Bheema R. Vijayendran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:10
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/122
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
In a liquid toner having as ingredients particles of carbon black pigment, aliphatic saturated hydrocarbon solvent and a resin soluble in the aliphatic saturated hydrocarbon, the improvement comprising: increasing the electrophoretic property of the carbon pigment particles by modifying the pigment surface with an organic modifying agent capable of modifying the carbon surfaces through doner/acceptor electron interactions by having a molecule structure containing at least three benzene rings and having a solubility of 0.03 to 6 grams per liter in the aliphatic saturated hydrocarbon solvent.
Claim 2
Dependent Claim
85 words
In a liquid toner having as ingredients particles of carbon black pigment, aliphatic saturated hydrocarbon solvent and a resin soluble in the aliphatic saturated hydrocarbon, the improvement comprising: increasing the electrophoretic property of the carbon pigment particles by modifying the pigment surface with an organic modifying agent capable of modifying the carbon surfaces through doner/acceptor electron interactions by having a molecule structure containing at least three benzene rings and having a solubility of 0.03 to 6 grams per liter in the aliphatic saturated hydrocarbon solvent.
Claim 3
Dependent Claim
24 words
The toner of claim 1 wherein the surface modifying agent is selected from the group consisting of azo dye, triphenyl methane, and 1,10 orthophenenthroline.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |