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Patent US5637431A successfully refreshed from Google Patents.
US5637431A
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Developer for electrophotography
Assignee: Konica Minolta Inc
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Filing: 1996-06-27
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Granted: 1997-06-10
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Expires: 2016-06-27
Abstract
Abstract Disclosed is a developer for electrophotography, comprising a carrier and toner particles, wherein said carrier comprises a magnetic particle having thereon a resin coated layer, said magnetic particle including Fe 2 O 3 and an oxide compound of at least one kind of a light metal selected from the group consisting of lithium, beryllium, sodium, magnesium, potassium, calcium and rubidium, and wherein said toner particles have a compound represented by Formula (1), wherein an amount (g) of the compound on the surface (m 2 ) of said toner particles, is 3.0×10 -3 to 1.2×10 -2 g/m 2 . : ##STR1## wherein, R 1 through R 4 independently represents an alkyl group having a carbon atom number of 1 to 18 or a benzyl group, A - represents an anion, provided that at least one of R 1 through R 4 represents an alkyl group having a carbon atom number of 8 to 18.
Inventors
- 👤 Kenji Yamane
- 👤 Tomomi Oshiba
- 👤 Yuji Marukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:15
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09741; G03G9/0975
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A developer for electrophotography, comprising a carrier and toner particles, wherein said carrier comprises a magnetic particle having thereon a resin coated layer, said magnetic particle including Fe 2 O 3 and an oxide compound of at least one kind of a light metal selected from the group consisting of lithium, beryllium, sodium, magnesium, potassium, calcium and rubidium, and wherein said toner particles have a compound represented by Formula (1), wherein an amount (g) of the compound on the surface (m 2 ) of said toner particles, is 3.0×10 -3 to 1.2×10 -2 g/m 2 . : ##STR7## wherein, R 1 through R 4 independently represents an alkyl group having a carbon atom number of 1 to 18 or a benzyl group, A - represents an anion, provided that at least one of R 1 through R 4 represents an alkyl group having a carbon atom number of 8 to 18.
Claim 2
Dependent Claim
151 words
A developer for electrophotography, comprising a carrier and toner particles, wherein said carrier comprises a magnetic particle having thereon a resin coated layer, said magnetic particle including Fe 2 O 3 and an oxide compound of at least one kind of a light metal selected from the group consisting of lithium, beryllium, sodium, magnesium, potassium, calcium and rubidium, and wherein said toner particles have a compound represented by Formula (1), wherein an amount (g) of the compound on the surface (m 2 ) of said toner particles, is 3.0×10 -3 to 1.2×10 -2 g/m 2 . : ##STR7## wherein, R 1 through R 4 independently represents an alkyl group having a carbon atom number of 1 to 18 or a benzyl group, A - represents an anion, provided that at least one of R 1 through R 4 represents an alkyl group having a carbon atom number of 8 to 18.
Claim 3
Dependent Claim
27 words
The developer of claim 1, wherein said amount of the compound on the surface of said toner particles, is 4.0×10 -3 to 1.0×10 -2 g/m 2 ..
Claim 4
Dependent Claim
13 words
The developer of claim 1, wherein said oxide compound is Li 2 O.
Claim 5
Dependent Claim
23 words
The developer of claim 1, wherein said A - represents a benzene having an anionic substituent or a naphthalene having an anionic substituent.
Claim 6
Dependent Claim
16 words
The developer of claim 4, wherein said anionic substituent is -SO3 31 or -COO - .
Claim 7
Dependent Claim
16 words
The developer of claim 1, wherein said A - represents a naphthalene having an anionic substituent.
Claim 8
Dependent Claim
16 words
The developer of claim 6, wherein said anionic substituent is -SO3 - or -COO - .
Claim 9
Dependent Claim
34 words
The developer of claim 1, wherein a ratio of said oxide compound of said light metal to said magnetic particle is 5 to 50 mol % by the total amount of said magnetic particle.
Claim 10
Dependent Claim
31 words
The developer of claim 1, wherein said magnetic particle contains a phosphorus compound in an amount of not more than 2 wt % by the total amount of said magnetic particle.
Claim 11
Dependent Claim
30 words
The developer of claim 1, wherein said magnetic particle contains a phosphorus compound in an amount of 0.05 to 1 wt % by the total amount of said magnetic particle.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |