US5286593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer containing stabilized charge director composition
Assignee: HP Indigo BV
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Filing: 1992-02-10
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Granted: 1994-02-15
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Expires: 2012-02-10
Abstract
Abstract A method for stabilizing a charge director solution, and a charge director composition made by this method, whereby a charge director is mixed with a solvent and a polar monomer species and a polymerization reaction is initiated and allowed to progress to completion.
Inventors
- 👤 Benzion Landa
- 👤 Yaacov Almog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:53
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; G03G9/135
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
A liquid developer comprising: a carrier liquid, toner particles, and a stabilized charge director including: a polymer insoluble in said carrier liquid and a charge director, soluble in said carrier liquid and at least partially present in the form of micelles, wherein said polymer is chemically incorporated into said micelles.
Claim 2
Dependent Claim
50 words
A liquid developer comprising: a carrier liquid, toner particles, and a stabilized charge director including: a polymer insoluble in said carrier liquid and a charge director, soluble in said carrier liquid and at least partially present in the form of micelles, wherein said polymer is chemically incorporated into said micelles.
Claim 3
Dependent Claim
12 words
The liquid developer of claim 1, wherein the charge director is lecithin.
Claim 4
Dependent Claim
11 words
The liquid developer of claim 1, wherein the polymer is polyvinylpyrrolidone.
Claim 5
Dependent Claim
69 words
A liquid developer comprising: a carrier liquid, toner particles, and a stabilized charge director composition formed by mixing a charge director, at least partially present in the form of micelles, with a solvent and a monomer species and then initiating a polymerization reaction among molecules of said monomer species and allowing said polymerization reaction to progress to completion, to produce a polymer which is chemically incorporated into said micelles.
Claim 6
Dependent Claim
69 words
A liquid developer comprising: a carrier liquid, toner particles, and a stabilized charge director composition formed by mixing a charge director, at least partially present in the form of micelles, with a solvent and a monomer species and then initiating a polymerization reaction among molecules of said monomer species and allowing said polymerization reaction to progress to completion, to produce a polymer which is chemically incorporated into said micelles.
Claim 7
Dependent Claim
36 words
The liquid developer of claim 4 wherein the stabilized charge director is at least partially present in the form of micelles and said charge director acts as a surfactant for the polymerization of the monomer species.
Claim 8
Dependent Claim
13 words
The liquid developer of claim 4, wherein the solvent is the carrier liquid.
Claim 9
Dependent Claim
12 words
The liquid developer of claim 4, wherein the charge director is lecithin.
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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |