US3714048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic liquid developer containing asphalt and modified alkyl resin
Assignee: Iwatsu Electric Co Ltd
•
Filing: 1970-09-28
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Granted: 1973-01-30
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Expires: 1990-09-28
Abstract
Abstract An electrophotographic liquid developer is provided which comprises a dispersion of at least one coloring material in particle form, asphalt and synthetic resin in an organic solvent having an electrical resistance of no less than 108 Omega . The liquid developer is useful for the preparation of lithographic plates.
Inventors
- 👤 S Adachi
- 👤 M Ueyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:24
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
An electrophotographic liquid developer for the preparation of lithographic plates which comprises a uniform dispersion of at least one coloring material in particle form having an average particle diameter of no more than 10 microns selected from pigment and dyestuff capable of carrying a positive charge, asphalt and an oil modified alkyd resin, in an organic solvent having an electrical resistance of no less than 108 Omega cm., said resin being at least partially soluble and not reducing the electrical resistance of said solvent to less than 108 Omega cm., said dispersion containing 5 to 75 percent by weight of said coloring material based on the total weight of solid material and in the remaining solid material of said dispersion, said oil-modified alkyd resin being present in an amount of 10 to 99 percent by weight and said asphalt in an amount of 1 to 90 percent by weight based on the amount of said asphalt and resin in said dispersion.
Claim 2
Dependent Claim
161 words
An electrophotographic liquid developer for the preparation of lithographic plates which comprises a uniform dispersion of at least one coloring material in particle form having an average particle diameter of no more than 10 microns selected from pigment and dyestuff capable of carrying a positive charge, asphalt and an oil modified alkyd resin, in an organic solvent having an electrical resistance of no less than 108 Omega cm., said resin being at least partially soluble and not reducing the electrical resistance of said solvent to less than 108 Omega cm., said dispersion containing 5 to 75 percent by weight of said coloring material based on the total weight of solid material and in the remaining solid material of said dispersion, said oil-modified alkyd resin being present in an amount of 10 to 99 percent by weight and said asphalt in an amount of 1 to 90 percent by weight based on the amount of said asphalt and resin in said dispersion.
Claim 3
Dependent Claim
18 words
An electrophotographic liquid developer according to claim 1 wherein said coloring material is insoluble in said organic solvent.
Claim 4
Dependent Claim
16 words
An electrophotographic liquid developer according to claim 1 in which said organic solvent contains aromatic hydrocarbon.
References Cited (Backward Citations)
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US3234017A
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US3438904A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |