Patent US4622281A successfully refreshed from Google Patents.
US4622281A
Expired / Lapsed
US
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Magnetic color toner containing gamma ferric oxide particles
Assignee: Canon Inc
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Filing: 1986-01-03
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Granted: 1986-11-11
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Expires: 2006-01-03
Abstract
Abstract A magnetic color toner stable to heat and light which does not fade or discolor for a long period of time is prepared by incorporating gamma -Fe2O3 particles as a magnetic component in a toner.
Inventors
- 👤 Eiichi Imai
- 👤 Hiroyuki Kobayashi
- 👤 Yasuo Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:46
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/083; G03G9/0831; G03G9/0833
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
38 words
A magnetic color toner providing a hue from red, orange, or yellow to sepia, comprising gamma-Fe 2 O 3 particles and a binder resin, wherein said toner is an insulating toner having enhanced triboelectric chargeability and enhanced transferrability.
Claim 2
Dependent Claim
38 words
A magnetic color toner providing a hue from red, orange, or yellow to sepia, comprising gamma-Fe 2 O 3 particles and a binder resin, wherein said toner is an insulating toner having enhanced triboelectric chargeability and enhanced transferrability.
Claim 3
Dependent Claim
27 words
The magnetic color toner of claim 1, which comprises 20-100 parts by weight of gamma-Fe 2 O 3 and 100 parts by weight of the binder resin.
Claim 4
Dependent Claim
17 words
The magnetic color toner of claim 1, which further contains a colorant soluble in the binder resin.
Claim 5
Dependent Claim
63 words
A magnetic color toner, comprising alpha-Fe 2 O 3 particles, magnetic gamma-Fe 2 O 3 particles as a main component of a magnetic material, and a binder resin in which 20-100 parts by weight of the magnetic material are contained in 100 parts by weight of the binder resin, wherein said toner is an insulating toner having enhanced triboelectric chargeability and enhanced transferrability.
Claim 6
Dependent Claim
63 words
A magnetic color toner, comprising alpha-Fe 2 O 3 particles, magnetic gamma-Fe 2 O 3 particles as a main component of a magnetic material, and a binder resin in which 20-100 parts by weight of the magnetic material are contained in 100 parts by weight of the binder resin, wherein said toner is an insulating toner having enhanced triboelectric chargeability and enhanced transferrability.
Claim 7
Dependent Claim
28 words
The magnetic color toner of claim 4, wherein gamma-Fe 2 O 3 particles are contained in an amount of at least 60% by weight to the magnetic material.
Claim 8
Dependent Claim
26 words
The magnetic color toner of claim 4, wherein alpha-Fe 2 O 3 is contained in an amount of 1-50% by weight based on the magnetic material.
Claim 9
Dependent Claim
17 words
The magnetic color toner of claim 4, which further contains a colorant soluble in the binder resin.
Claim 10
Dependent Claim
79 words
A process for forming color images comprising: (a) developing electrostatic latent images on a latent image-bearing member by a magnetic color insulating toner providing a hue from red, orange, or yellow to sepia comprising magnetic gamma-Fe 2 O 3 particles as a main component of a magnetic material, a binder resin, and a colorant soluble in the binder resin; (b) transferring toner images of the latent images onto a transfer recording medium; and (c) cleaning the latent image-bearing member.
Claim 11
Dependent Claim
79 words
A process for forming color images comprising: (a) developing electrostatic latent images on a latent image-bearing member by a magnetic color insulating toner providing a hue from red, orange, or yellow to sepia comprising magnetic gamma-Fe 2 O 3 particles as a main component of a magnetic material, a binder resin, and a colorant soluble in the binder resin; (b) transferring toner images of the latent images onto a transfer recording medium; and (c) cleaning the latent image-bearing member.
Claim 12
Dependent Claim
26 words
The process of claim 8, wherein the toner comprises 20-100 parts by weight of the magnetic material and 100 parts by weight of the binder resin.
Claim 13
Dependent Claim
28 words
The process of claim 8, wherein magnetic gamma-Fe 2 O 3 particles are contained in an amount of at least 60% by weight based on the magnetic material.
Claim 14
Dependent Claim
16 words
The process of claim 8, wherein the latent image-bearing member is an organic photoconductive photosensitive member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |