Patent EP0142731A1 successfully refreshed from Google Patents.
EP0142731A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Carrier of developer electrophotographic copying machines
Assignee: Nippon Iron Powder Co Ltd
•
Filing: 1984-10-23
•
Granted: —
•
Expires: 2004-10-23
Abstract
Abstract A carrier of developers composed of a composition represented by (MO)x (Fe2O3)Y having bulk density of 1.8 - 3.4 g/Cn and magnetization of 10-30 emu/g in a magnetic field of 450-1000 0 (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.
Inventors
- 👤 Hidekiyo Tachibana
- 👤 Akihiko Noda
- 👤 Kazuo Terao
- 👤 Toshio Honjou
- 👤 Yukio Seki
- 👤 Hiroshi Endo
- 👤 Toshio Yokobari
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:28
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/107; G03G9/1075
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A carrier for a developer composed of a composition represented by (MO) X (Fe 2 O 3 ) Y having bulk density of 1.8 - 3.4 g/Cm and magnetization of 10 - 30 emu/g in a magnetic field of 450 - 1000 Ö (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.
Claim 2
Dependent Claim
65 words
A carrier for a developer composed of a composition represented by (MO) X (Fe 2 O 3 ) Y having bulk density of 1.8 - 3.4 g/Cm and magnetization of 10 - 30 emu/g in a magnetic field of 450 - 1000 Ö (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.
Claim 3
Dependent Claim
32 words
A carrier for a developer according to claim 1, wherein said carrier is composed of (CuO) 0.15 - 0.4, (ZnO) 0 - 0.2, and (Fe 2 0 3 ) 0.6 - 0.7.
Claim 4
Dependent Claim
20 words
A carrier for a developer according to claim 1, wherein said carrier is composed of said composition coated with resin.
Claim 5
Dependent Claim
15 words
A carrier for a developer according to claim 3, wherein said resin is styrene resin.
Claim 6
Dependent Claim
15 words
A carrier for a developer according to claim 3, wherein said resin is fluoro resin.
Claim 7
Dependent Claim
18 words
A carrier for a developer according to claim 1, wherein the mole ratio X/Y is less than 0.85.
Claim 8
Dependent Claim
76 words
A developer comprising a mixture of a toner and a carrier for the toner, said carrier composed of a composition represented by (MO) X (Fe 2 O 3 ) Y having bulk density of 1.8- 3.4 g/Cm 3 and magnetization of 10 - 30 emu/g in a magnetic field of 450 - 1000 Ö (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.
Claim 9
Dependent Claim
76 words
A developer comprising a mixture of a toner and a carrier for the toner, said carrier composed of a composition represented by (MO) X (Fe 2 O 3 ) Y having bulk density of 1.8- 3.4 g/Cm 3 and magnetization of 10 - 30 emu/g in a magnetic field of 450 - 1000 Ö (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.