US4486502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-coated carrier for use in two-component electrophotographic developers
Assignee: Toshiba Corp
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Filing: 1983-01-04
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Granted: 1984-12-04
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Expires: 2003-01-04
Abstract
Abstract A carrier for use as a component in electrophotographic two-component developers which is improved in durability of the triboelectric property by coating the surface of the iron core particles of carrier with a resinous composition comprised essentially of an epoxy-hydroxy hydrocarbon resin and a silicone resin.
Inventors
- 👤 Kenkichi Hara
- 👤 Shigeo Yokoe
- 👤 Kazuyoshi Oka
- 👤 Tamotsu Murakami
- 👤 Tsugifusa Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1135; G03G9/1136; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
34 words
A carrier for use with toner in a two component electrophotographic developer which comprises a particulate core material coated with a resinous composition consisting essentially of an epoxy-hydroxy hydrocarbon resin and a silicone resin.
Claim 2
Dependent Claim
34 words
A carrier for use with toner in a two component electrophotographic developer which comprises a particulate core material coated with a resinous composition consisting essentially of an epoxy-hydroxy hydrocarbon resin and a silicone resin.
Claim 3
Dependent Claim
24 words
A carrier as claimed in claim 1 in which the resinous composition comprises from 1% to 30% by weight of the epoxyhydroxy hydrocarbon resin.
Claim 4
Dependent Claim
33 words
A carrier as claimed in claim 1 or 2 in which the epoxy-hydroxy hydrocarbon resin has a hydroxyl equivalent of from 500 to 1200 and an epoxy equivalent of from 400 to 1000.
Claim 5
Dependent Claim
18 words
An electrophotographic developer comprising a toner and a carrier as claimed in any one of the preceding claims.
Claim 6
Dependent Claim
35 words
The carrier of claim 3, wherein the epoxy-hydroxy hydrocarbon resin comprises a normally solid polymer prepared by the cationic polymerization of 1, 3-pentadiene with subsequent introduction of epoxy and hydroxyl groups into the polymeric intermediate.
Claim 7
Dependent Claim
15 words
The carrier of claim 1, wherein the hydrocarbon resin is an epoxidized, hydroxylated diene polymer.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |