US3718593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of an electrophotographic liquid developer containing gelatin
Assignee: Fujifilm Holdings Corp
•
Filing: 1970-02-05
•
Granted: 1973-02-27
•
Expires: 1990-02-05
Abstract
Abstract A process for producing a liquid developer for developing electrostatic latent images which comprises (1) adding to an aqueous solution of gelatin, the concentration of the gelatin being in the range of approximately 1 to 20 percent by weight, an alcohol in an amount less than that of causing the precipitation of gelatin to provide a solution of gelatin in a water-alcohol mixed solvent, (2) dispersing the solution thus prepared in an organic solvent which is miscible with water but is a non-solvent for gelatin to form a dispersion of fine gelatin particles where the amount of said organic solvent is at least 10 times the amount of the mixed gelatin solution of water and alcohol and recovering the fine gelatin particles from the dispersion, and (3) dispersing the fine gelatin particles thus recovered in a carrier having an electric resistance of higher than 101010 Omega cm.
Inventors
- 👤 Y Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/125; B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; G03G13/00; G03G13/26; G03G8/00; G03G9/13
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
dispersing the solution thus prepared in an organic solvent which is miscible with water but is a non-solvent for gelatin to form a dispersion of fine gelatin particles where the amount of said organic solvent is at least 10 times the amount of the mixed gelatin solution of water and alcohol and recovering said fine gelatin particles from the dispersion,
Claim 2
Dependent Claim
17 words
The process as claimed in claim 1 wherein said alcohol is methanol, ethanol, isopropyl alcohol, or glyceRine.
Claim 3
Dependent Claim
61 words
dispersing the solution thus prepared in an organic solvent which is miscible with water but is a non-solvent for gelatin to form a dispersion of fine gelatin particles where the amount of said organic solvent is at least 10 times the amount of the mixed gelatin solution of water and alcohol and recovering said fine gelatin particles from the dispersion, and
Claim 4
Dependent Claim
26 words
The process as claimed in claim 1 wherein the amount of the alcohol is 0.1-3 parts by weight per 1 part by weight of gelatin solution.
Claim 5
Dependent Claim
20 words
dispersing the fine gelatin particles thus recovered in a carrier having an electric resistance of higher than 1010 Omega cm.
Claim 6
Dependent Claim
22 words
washing said gelatin particles thus recovered with an organic solvent which is miscible with water and is a non-solvent for gelatin, and
Claim 7
Dependent Claim
21 words
dispersing said fine gelatin particles thus washing in a carrier liquid having an electric resistance of higher than 1010 Omega cm.
Claim 8
Dependent Claim
28 words
The process as claimed in claim 1 wherein said organic solvent which is miscible with water but is a non-solvent for gelatin is acetone, methylethyl ketone, or ethanol.
Claim 9
Dependent Claim
21 words
The process as claimed in claim 1 wherein said carrier liquid is cyclohexane, kerosene, gasoline, iso-octane, heptane, hexane, or a chlorofluorohydrocarbon.
Claim 10
Dependent Claim
14 words
A process for producing a liquid developer for developing electrostatic latent images which comprises:
Claim 11
Dependent Claim
17 words
The process as claimed in claim 1 wherein said alcohol is methanol, ethanol, isopropyl alcohol, or glycerine.
Claim 12
Dependent Claim
27 words
The process as claimed in claim 1 wherein said organic solvent to be employed in the step (2) or (3) is acetone, methyl ethyl ketone, or ethanol.
Claim 13
Dependent Claim
21 words
The process as claimed in claim 1 wherein said carrier liquid is cyclohexane, kerosene, gasoline, iso-octane, heptane, hexane, or a chlorofluorohydrocarbon.
Claim 14
Dependent Claim
27 words
The process as claimed in claim 1 wherein the amount of said alcohol is 0.1-3 parts by weight per 1 part by weight of the gelatin solution.
References Cited (Backward Citations)
US1854061A
Cited
US2197843A
Cited
US2165413A
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US2297691A
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US2527268A
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US3137630A
Cited
US3357830A
Cited
US3682825A
Cited
US3558756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |