Patent US3779836A successfully refreshed from Google Patents.
Patent US4425382A successfully refreshed from Google Patents.
US4425382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer carrier
Assignee: Ricoh Co Ltd
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Filing: 1982-10-28
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Granted: 1984-01-10
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Expires: 2002-10-28
Abstract
Abstract The present invention provides an improved method for manufacturing a developer carrier for use in a device for developing an electrostatic latent image, for example, formed on a photosensitive member. The present method allows to make a developer carrier which is durable and which can carry out ideal developing performance. In accordance with the present method, after forming a first adhesive layer on a support, conductive particles are deposited, followed by the step of forming a second adhesive layer to have the particles embedded therein. Then, the resulting structure is ground to have at least some of the particles exposed at the ground surface.
Inventors
- 👤 Syouji Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928; G03G15/0806; G03G15/0818; G03G5/00; G03G5/10; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A method for manufacturing a developer carrier for use in a device for developing an electrostatic latent image, said method comprising the steps of: (a) forming a first layer of a first adhesive and substantially insulating material on the surface of a conductive support; (b) depositing particles of an electrically conductive material on the surface of said first layer before said first material is hardened substantially; (c) forming a second layer of a second adhesive and substantially insulating material on the particle-deposited surface of said first layer; and (d) grinding the thus formed structure to have at least some of said particles ground to be exposed at the resulting surface.
Claim 2
Independent Claim
110 words
A method for manufacturing a developer carrier for use in a device for developing an electrostatic latent image, said method comprising the steps of: (a) forming a first layer of a first adhesive and substantially insulating material on the surface of a conductive support; (b) depositing particles of an electrically conductive material on the surface of said first layer before said first material is hardened substantially; (c) forming a second layer of a second adhesive and substantially insulating material on the particle-deposited surface of said first layer; and (d) grinding the thus formed structure to have at least some of said particles ground to be exposed at the resulting surface.
Claim 3
Dependent Claim
20 words
A method as in claim 1 wherein said first and second adhesive and substantially insulating materials are the same material.
Claim 4
Dependent Claim
17 words
A method as in claim 2 wherein said adhesive and substantially insulating material includes an epoxy resin.
Claim 5
Dependent Claim
20 words
A method as in claim 1 wherein said support is comprised of a non-magnetic material including aluminum and stainless steel.
Claim 6
Dependent Claim
18 words
A method as in claim 1 or 4 wherein said support is in the shape of a cylinder.
Claim 7
Dependent Claim
43 words
A method as in claim 1 further comprising the step of forming an underlying layer of a dielectric material on the surface of said conductive support prior to the step of (a) so that said first layer is formed on said underlying layer.
Claim 8
Dependent Claim
16 words
A method as in claim 1 wherein said particles are previously coated with an insulating material.
Claim 9
Dependent Claim
24 words
A method as in claim 1 further comprising the step of pressing the deposited particles into said first layer prior to the step (c).
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |