Patent US4503136A successfully refreshed from Google Patents.
US4503136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-component resin system of acrylic and diene polymers for coating electrophotographic carrier particles
Assignee: Toshiba Corp
•
Filing: 1983-01-24
•
Granted: 1985-03-05
•
Expires: 2003-01-24
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 an acrylic resin.
Inventors
- 👤 Kenkichi Hara
- 👤 Shigeo Yokoe
- 👤 Kazuyoshi Oka
- 👤 Tamotsu Murakami
- 👤 Tsugifusa Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:52
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1133; G03G9/1135
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
An electrographic carrier comprising a particulate core material coated with a two-component resin composition consisting essentially of an epoxidized-hydroxylated 1,3-pentadiene polymer and an acrylic resin, said polymer having a hydroxyl equivalent of from about 500-1200 and an epoxy equivalent of from about 400-1000.
Claim 2
Dependent Claim
43 words
An electrographic carrier comprising a particulate core material coated with a two-component resin composition consisting essentially of an epoxidized-hydroxylated 1,3-pentadiene polymer and an acrylic resin, said polymer having a hydroxyl equivalent of from about 500-1200 and an epoxy equivalent of from about 400-1000.
Claim 3
Dependent Claim
23 words
A carrier as claimed in claim 1, wherein said polymer comprises from about 1 to 30% by weight of said two-component resin composition.
Claim 4
Dependent Claim
23 words
A carrier as claimed in claim 2, wherein said polymer comprises from about 2 to 10% by weight of said two-component resin composition.
Claim 5
Dependent Claim
47 words
A carrier as claimed in claim 1, wherein the core material is coated by dissolving the epoxidized-hydroxylated 1,3-pentadiene polymer and the acrylic resin together in a solvent to form a coating liquid, applying the coating liquid to the particulate core material, and evaporating the solvent to dryness.
Claim 6
Dependent Claim
22 words
A carrier as claimed in claim 1, wherein the core material is an iron powder having a particle size of about 30-200μ.
Claim 7
Dependent Claim
18 words
An electrophotographic developer comprising a toner and a carrier as claimed in any one of the preceding claims.
References Cited (Backward Citations)
JPS4834190A
Cited
US4042517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |