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Patent US4816364A successfully refreshed from Google Patents.
US4816364A
Expired / Lapsed
US
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Magnetic carrier particles for electrophotographic developer having plated layer of iron oxide
Assignee: Nippon Paint Co Ltd
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Filing: 1987-09-03
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Granted: 1989-03-28
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Expires: 2007-09-03
Abstract
Abstract The present invention is intended to provide a carrier to be used as a two-component developer, wherein a nuclide particle surface has a magnetic plated layer composed of an iron oxide. The carrier according to the present invention is to be used in the electrophotographic method, electrostatic recording method, and electrostatic printing method, and also provides an excellent developer which is lightweight and has a long service life.
Inventors
- 👤 Masao Oishi
- 👤 Takao Saito
- 👤 Kouichi Nagata
- 👤 Katsukiyo Ishikawa
- 👤 Eio Hisajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/107; G03G9/1075; G03G9/113; G03G9/1139; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
52 words
A magnetic carrier for use in a developer composition having a saturation magnetization ranging from 20 to 80 emu/g, wherein a magnetic plated layer composed of an iron oxide is formed on each surface of a nuclide particle selected from the group consisting of a resin particle and an inorganic hollow particle.
Claim 2
Dependent Claim
52 words
A magnetic carrier for use in a developer composition having a saturation magnetization ranging from 20 to 80 emu/g, wherein a magnetic plated layer composed of an iron oxide is formed on each surface of a nuclide particle selected from the group consisting of a resin particle and an inorganic hollow particle.
Claim 3
Dependent Claim
20 words
A magnetic carrier as claimed in claim 1, wherein the specific gravity of each plated particle is less than 4.0.
Claim 4
Dependent Claim
17 words
A magnetic carrier as claimed in claim 1, wherein the magnetic plated layer is composed of ferrite.
Claim 5
Dependent Claim
23 words
A magnetic carrier as claimed in claim 1, wherein the magnetic plated layer is formed by means of an electroless ferrite plating method.
Claim 6
Dependent Claim
16 words
A magnetic carrier as claimed in claim 1, wherein the nuclide particle is a resin particle.
Claim 7
Dependent Claim
22 words
A magnetic carrier as claimed in claim 1, wherein the average diameter of magnetic plated particles ranges from 10 to 60 microns.
Claim 8
Dependent Claim
22 words
A magnetic carrier as claimed in claim 1, wherein the magnetic plated layer on the nuclide particle surface is coated with resin.
Claim 9
Dependent Claim
22 words
A magnetic carrier as claimed in claim 2, wherein the magnetic plated layer on the nuclide particle surface is coated with resin.
Claim 10
Dependent Claim
22 words
A magnetic carrier as claimed in claim 3, wherein the magnetic plated layer on the nuclide particle surface is coated with resin.
Claim 11
Dependent Claim
22 words
A magnetic carrier as claimed in claim 4, wherein the magnetic plated layer on the nuclide particle surface is coated with resin.
Claim 12
Dependent Claim
22 words
A magnetic carrier as claimed in claim 5, wherein the magnetic plated layer on the nuclide particle surface is coated with resin.
Claim 13
Dependent Claim
22 words
A magnetic carrier as claimed in claim 6, wherein the magnetic plated layer on the nuclide particle surface is coated with resin.
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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |