US3674693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversal electrostatic toner composition
Assignee: AB Dick Co
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Filing: 1970-05-25
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Granted: 1972-07-04
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Expires: 1990-05-25
Abstract
Abstract A liquid developer composition for reversal toning of a latent electrostatic image which comprises a tone concentrate formed of finely divided pigment particles dispersed in a mixture of a polymeric binder, a high dielectric diluent and a phospholipid charge stabilizing material which is admixed with an aliphatic carrier liquid to provide the developer composition.
Inventors
- 👤 Alexander U Averbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:02
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; G03G9/135
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A composition as defined in claim 1 wherein the composition is in the form of a concentrate for admixture with additional amounts of diluent and contains 5-40 percent by weight of the binder, 1-10 percent by weight of the pigment particles, 1-10 percent by weight of the phospholipid and 10-80 percent by weight of the diluent.
Claim 2
Dependent Claim
30 words
A composition as defined in claim 1 wherein said pigment particles are provided in the form of a dispersed rubber ink whereby said composition also contains a cyclized rubber resin.
Claim 3
Dependent Claim
14 words
A composition as defined in claim 1 wherein said pigment particles are carbon black.
Claim 4
Dependent Claim
24 words
A composition as defined in claim 1 wherein said diluent is selected from the group consisting of paraffinic hydrocarbons, aromatic hydrocarbons and mixtures thereof.
Claim 5
Dependent Claim
22 words
A composition as defined in claim 1 wherein said diluent is a mixture of a paraffinic hydrocarbon oil and an aromatic hydrocarbon.
Claim 6
Dependent Claim
12 words
A composition as defined in claim 1 wherein said phospholipid is lecithin.
Claim 7
Dependent Claim
42 words
A composition as defined in claim 1 wherein said phospholipid is selected from the group consisting of phosphatidyl cholines and mixtures of phosphatidyl cholines with one or more materials selected from the group consisting of phosphatidyl ethanolamines, phosphatidyl L-serines and phosphatidyl inositols.
Claim 8
Dependent Claim
89 words
A toner composition for reversal toning of a latent electrostatic image wherein the toner is attracted to the background areas and repelled by the image areas of the latent electrostatic image, comprising 0.001-0.01 percent by weight of pigment particles, 0.005-0.04 percent by weight of a binder in the form of a heat reactive cyclopentadiene hydrocarbon resin, 0.001-0.01 percent by weight of a charge stabilizer in the form of a phospholipid, with the balance of the composition being an organic diluent having a volume resistivity in excess of 105 ohm-cm.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |