US3985559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner powder for electrostatic images
Assignee: Canon Production Printing Holding BV
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Filing: 1974-10-16
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Granted: 1976-10-12
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Expires: 1994-10-16
Abstract
Abstract Toner powders for developing electrostatic images are provided with improved control of the polarity and the color of the particles by forming them of thermoplastic resin containing in dissolved state therein a normal salt of an organic basic dye, e.g. a Safranine dye, and an organic acid, e.g. a phenoxy acetic acid, having at least 6 carbon atoms and having a dissociation constant less then 4 as measured in water at 25 DEG C.
Inventors
- 👤 Martinus T. J. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
Toner powder for the development of electrostatic images, comprising colored, thermoplastic resin particles, characterized in that said resin particles contain in dissolved condition therein a normal salt of an organic basic dye and an organic acid having at least 6 carbon atoms and having a dissociation constant lower than 4 as measured in water at 25 C., the dye of said salt being selected from the group consisting of di- and triphenylmethane dyes, azine dyes, acridine dyes, oxazine dyes, thiazine dyes, xanthene dyes and mono-azodyes.
Claim 2
Dependent Claim
85 words
Toner powder for the development of electrostatic images, comprising colored, thermoplastic resin particles, characterized in that said resin particles contain in dissolved condition therein a normal salt of an organic basic dye and an organic acid having at least 6 carbon atoms and having a dissociation constant lower than 4 as measured in water at 25 C., the dye of said salt being selected from the group consisting of di- and triphenylmethane dyes, azine dyes, acridine dyes, oxazine dyes, thiazine dyes, xanthene dyes and mono-azodyes.
Claim 3
Dependent Claim
15 words
Toner powder according to claim 1, the dye of said salt being a Safranine dye.
Claim 4
Dependent Claim
18 words
Toner powder according to claim 1, the organic acid of said salt being a monocarboxylic or monosulfonic acid.
Claim 5
Dependent Claim
21 words
Toner powder according to claim 1, the organic acid of said salt being a monoalkyl- or mono(alkylaryl) -ester of sulfuric acid.
Claim 6
Dependent Claim
92 words
Toner powder according to claim 1, the organic acid of said salt being of the general formula: ##STR3## in which R and R 1 each represents an alkyl group having at least 4 carbon atoms, R 2 is a hydrogen atom or an alkyl group, and X stands for an alkoxy or cycloalkoxy group having at least 4 carbon atoms, an aryloxy group, or a group ##STR4## in which R 3 is a hydrogen atom or an alkyl or aryl group and R 4 is a hydrogen atom or an alkyl group.
Claim 7
Dependent Claim
37 words
Toner powder according to claim 5, said acid being one having said general formula II wherein X is a group: ##SPC2## in which R 5 is an alkyl or alkoxy group and n is 1 or 2.
Claim 8
Dependent Claim
53 words
Toner powder according to claim 1, the basic dye of said salt being a Safranine dye and the organic acid of said salt having the formula: ##SPC3## in which R 2 is a hydrogen atom or an alkyl group, R 5 is an alkyl or alkoxy group and n is 1 or 2.
References Cited (Backward Citations)
US3236639A
Cited
US3647696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |