US4797341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer for electrophotography
Assignee: Ricoh Co Ltd
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Filing: 1986-09-04
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Granted: 1989-01-10
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Expires: 2006-09-04
Abstract
Abstract This invention relates to a liquid developer for electrophotography comprising toner particles dispersed in a highly insulative aliphatic hydrocarbon and/or halogenated hydrocarbon carrier liquid having a low dielectric constant, said toner particles having two particle size distributions of a mean small particle size in the range of 0.01 mu m to 1 mu m and a mean large particle size in the range of 2 mu m to 30 mu m, characterized in that said large toner particles in the range of 2 mu m to 30 mu m are prepared by using polytetrafluoroethylene as the main binder resin.
Inventors
- 👤 Kazuo Tsubuko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A liquid developer for electrophotography comprising a coloring agent and toner particles dispersed in a highly insulating aliphatic hydrocarbon and/or halogenated hydrocarbon carrier liquid having a low dielectric constant, said toner particles having two particle size distributions of a mean small toner particle size in the range of 0.01 μm to 1 μm and a mean large toner particle size in the range of 2 μm to 30 μm, characterized in that said large toner particles in the range of 2 μm to 30 μm are prepared by using polytetrafluoroethylene as the main binder resin.
Claim 2
Dependent Claim
95 words
A liquid developer for electrophotography comprising a coloring agent and toner particles dispersed in a highly insulating aliphatic hydrocarbon and/or halogenated hydrocarbon carrier liquid having a low dielectric constant, said toner particles having two particle size distributions of a mean small toner particle size in the range of 0.01 μm to 1 μm and a mean large toner particle size in the range of 2 μm to 30 μm, characterized in that said large toner particles in the range of 2 μm to 30 μm are prepared by using polytetrafluoroethylene as the main binder resin.
Claim 3
Dependent Claim
37 words
The liquid developer for electrophotography as claimed in claim 1, wherein said large toner particles are present in an amount of 1.0 to 50% by weight on the basis of the weight of the total toner amount.
Claim 4
Dependent Claim
17 words
The liquid developer for electrophotography as claimed in claim 1, wherein said toner particles comprise carbon black.
Claim 5
Dependent Claim
17 words
The liquid developer for electrophotography as claimed in claim 1, wherein said toner particles comprise Benzidine Yellow.
Claim 6
Dependent Claim
17 words
The liquid developer for electrophotography as claimed in claim 1, wherein kerosene is used as a solvent.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |