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US4598034A
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Ferrite carriers for electrophotographic development
Assignee: Powdertech Co Ltd
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Filing: 1985-01-07
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Granted: 1986-07-01
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Expires: 2005-01-07
Abstract
Abstract A carriers for electrophotographic development which comprises essentially a disintegrated powder of granules consisting essentially of the compound represented by the formula (MO).sub.X (Fe.sub.2 O.sub.3).sub.Y in which M is at least one metal selected from the group consisting of Li, Zn, Cd, Cu, Co, and Mg, and X (mol)/Y (mol)≦0.85.
Inventors
- 👤 Toshio Honjo
- 👤 Yukio Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:09
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/107; G03G9/1075; G03G9/108; G03G9/1085
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
30 words
A carrier for electrophotographic development comprising essentially a disintegrated powder of granules consisting essentially of the compound represented by the formula: (CuO).sub.a (ZnO).sub.b (Fe.sub.2 O.sub.3).sub.c in which a(mol)+b(mol)+c(mol)=1 and 0.42≦(a+b)/c≦0.85.
Claim 2
Dependent Claim
30 words
A carrier for electrophotographic development comprising essentially a disintegrated powder of granules consisting essentially of the compound represented by the formula: (CuO).sub.a (ZnO).sub.b (Fe.sub.2 O.sub.3).sub.c in which a(mol)+b(mol)+c(mol)=1 and 0.42≦(a+b)/c≦0.85.
Claim 3
Dependent Claim
10 words
The carrier according to claim 1, wherein 0.05≦a≦0.45 and 0≦b≦0.40.
Claim 4
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .155 (ZnO) 0 .30 (Fe 2 O 3 ) 0 .545.
Claim 5
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .215 (ZnO) 0 .24 (Fe 2 O 3 ) 0 .545.
Claim 6
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .175 (ZnO) 0 .215 (Fe 2 O 3 ) 0 .61.
Claim 7
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .155 (ZnO) 0 .145 (Fe 2 O 3 ) 0 .70.
Claim 8
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .215 (ZnO) 0 .19 (Fe 2 O 3 ) 0 .595.
Claim 9
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .22 (ZnO) 0 .115 (Fe 2 O 3 ) 0 .665.
Claim 10
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .22 (ZnO) 0 .10 (Fe 2 O 3 ) 0 .68.
Claim 11
Dependent Claim
23 words
The carrier according to claim 1, wherein said formula is (CuO) 0 .10 (ZnO) 0 .10 (Fe 2 O 3 ) 0 .80.
Claim 12
Dependent Claim
35 words
A carrier for electrophotographic development consisting essentially of a disintegrated powder of granules having the following composition, said disintegrated powder being reduced on the surface thereof, (CuO).sub.a (ZnO).sub.b (Fe.sub.2 O.sub.3).sub.c in which a(mol)+b(mol)+c(mol)=1 and 0.42≦(a+b)/c≦0.85.
Claim 13
Dependent Claim
35 words
A carrier for electrophotographic development consisting essentially of a disintegrated powder of granules having the following composition, said disintegrated powder being reduced on the surface thereof, (CuO).sub.a (ZnO).sub.b (Fe.sub.2 O.sub.3).sub.c in which a(mol)+b(mol)+c(mol)=1 and 0.42≦(a+b)/c≦0.85.
Claim 14
Dependent Claim
37 words
A carrier for electrophotographic development consisting essentially of a disintegrated powder of granules having the following composition, said disintegrated powder having a resin coating on the surface thereof, (CuO).sub.a (ZnO).sub.b (Fe.sub.2 O.sub.3).sub.c in which a(mol)+b(mol)+c(mol)=1 and 0.42≦(a+b)/c≦0.85.
Claim 15
Dependent Claim
37 words
A carrier for electrophotographic development consisting essentially of a disintegrated powder of granules having the following composition, said disintegrated powder having a resin coating on the surface thereof, (CuO).sub.a (ZnO).sub.b (Fe.sub.2 O.sub.3).sub.c in which a(mol)+b(mol)+c(mol)=1 and 0.42≦(a+b)/c≦0.85.
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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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |