Patent US4024084A successfully refreshed from Google Patents.
US4024084A
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Dispersion for applying solid particles on surfaces by an electrophotographic process
Assignee: US Philips Corp
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Filing: 1975-12-15
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Granted: 1977-05-17
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Expires: 1995-12-15
Abstract
Abstract The composition of liquid toners and hence the recycling of such toners is simplified when, as the only substance controlling the charge of the pigments and luminescent substances, respectively, an aluminium (III) salt or a chromium (III) salt of an anthranilic acid possibly substituted at the benzene nucleus is used and the amino group of which is acylated with a fatty acid containing 6 to 20 carbon atoms.
Inventors
- 👤 Hans Gunter Sittardt
- 👤 Siegfried Stotz
- 👤 Dirk Jan Zwanenburg
- 👤 Wilhelmus Adrianus Petrus Reijnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:11
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783; G03G9/12; G03G9/135; G03G9/1355
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
A dispersion for applying solid particles on a surface by an electrophotographic process, said dispersion comprising, in addition to the solid particles to be applied to the surface, a non-polar liquid dispersing agent for said solid particles, a non-ionic macromolecular compound of a molecular weight of 100,000 - 1,500,000, soluble in said liquid dispersing agent and as the sole substance for controlling the charge on said solid particles a metal salt selected from the group consisting of salts of the formulae: Al(AN).sub.n (OH).sub.3.sub.-n and Cr(AN).sub.n (OH).sub.3.sub.-n wherein n = 1, 2, or 3 and AN is the acid residue of an anthranilic acid, the amino group of which is acylated with a fatty acid of 6 to 20 carbon atoms, said metal salt being soluble in the dispersing agent and being present in an amount of 10.sup. -3 to 10.sup. -1 g per 100 g of said solid particles.
Claim 2
Dependent Claim
149 words
A dispersion for applying solid particles on a surface by an electrophotographic process, said dispersion comprising, in addition to the solid particles to be applied to the surface, a non-polar liquid dispersing agent for said solid particles, a non-ionic macromolecular compound of a molecular weight of 100,000 - 1,500,000, soluble in said liquid dispersing agent and as the sole substance for controlling the charge on said solid particles a metal salt selected from the group consisting of salts of the formulae: Al(AN).sub.n (OH).sub.3.sub.-n and Cr(AN).sub.n (OH).sub.3.sub.-n wherein n = 1, 2, or 3 and AN is the acid residue of an anthranilic acid, the amino group of which is acylated with a fatty acid of 6 to 20 carbon atoms, said metal salt being soluble in the dispersing agent and being present in an amount of 10.sup. -3 to 10.sup. -1 g per 100 g of said solid particles.
Claim 3
Dependent Claim
16 words
A dispersion as claimed in claim 1, wherein in the formulae n = 1 or 2.
Claim 4
Dependent Claim
38 words
The dispersion of claim 1 wherein the nucleus of the acylated anthranilic acid is substituted with at least a moiety selected from the group consisting of halogen, aryl, alkyl, aralkyl, nitro, amino, O-alkyl, O-aryl, O-aralkyl, hydroxyl and ester.
Claim 5
Dependent Claim
17 words
The dispersion of claim 1 wherein the amino group of the anthranilic acid is acylated with stearyl.
Claim 6
Dependent Claim
17 words
The dispersion of claim 1 wherein the amino group of the anthranilic acid is acylated with lauryl.
Claim 7
Dependent Claim
17 words
The dispersion of claim 1 wherein the amino group of the anthranilic acid is acylated with oleyl.
Claim 8
Dependent Claim
23 words
The dispersion of claim 1 wherein the non-ionic macromolecular compound is a polymethacrylate, the ester components of which are of 6-20 carbon atoms.
Claim 9
Dependent Claim
29 words
The dispersion of claim 1 wherein the non-ionic macro-molecular compound is a copolymer of vinyl pyridine with a methacrylate the ester components of which are of 6-20 carbon atoms.
Claim 10
Dependent Claim
20 words
The dispersion of claim 1 wherein the solid particles are luminescent substances suitable for use in color television display tubes.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |