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Patent US4833058A successfully refreshed from Google Patents.
US4833058A
Expired / Lapsed
US
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Developing apparatus
Assignee: Ricoh Co Ltd
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Filing: 1987-09-17
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Granted: 1989-05-23
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Expires: 2007-09-17
Abstract
Abstract This invention relates to a developing apparatus for one component type toner, which has a thin film-forming element applying a thin film of one component type toner on the surface of a toner holder, characterized in that said thin film-forming element is composed of a silicone rubber comprising 100 parts by weight of a siloxane polymer having a cross linking density of 4-8×10 -4 mol/cc and 30-70 parts by weight of silica.
Inventors
- 👤 Yasuo Hirano
- 👤 Kazuo Nojima
- 👤 Motoi Orihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0812; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
A developing apparatus for developing a latent image with a one component-type toner, comprising a movable toner holder for receiving on its surface a thin film of said toner, and a stationary, doctor blade having an edge located in close proximity to said toner holder for controlling the thickness of the film of toner on said surface, said doctor blade consisting of silicone rubber composed of (1) 100 parts by weight of a siloxane polymer having a cross-linking density of from 4 to 8×10 -4 mol/cc, and (2) from 30 to 70 parts by weight of silica.
Claim 2
Dependent Claim
97 words
A developing apparatus for developing a latent image with a one component-type toner, comprising a movable toner holder for receiving on its surface a thin film of said toner, and a stationary, doctor blade having an edge located in close proximity to said toner holder for controlling the thickness of the film of toner on said surface, said doctor blade consisting of silicone rubber composed of (1) 100 parts by weight of a siloxane polymer having a cross-linking density of from 4 to 8×10 -4 mol/cc, and (2) from 30 to 70 parts by weight of silica.
Claim 3
Dependent Claim
18 words
The developing apparatus of claim 1, wherein said siloxane polymer comprises methyl vinyl polysiloxane as the main component.
Claim 4
Dependent Claim
21 words
A method for developing electrostatic latent images with one component type toner using the developing apparatus as claimed in claim 1.
Claim 5
Dependent Claim
24 words
The developing apparatus of claim 1, wherein said silicone rubber further contains at least one of inorganic filler, crosslinking agent, thermostabilizer and processing aid.
Claim 6
Dependent Claim
51 words
The developing apparatus of claim 4, wherein said inorganic filler is at least one selected from the group consisting of diatomaceous earth, quartz powder, iron oxide, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, talc, aluminum silicate, aluminum oxide, carbon black, potassium titanate, asbestos, glass, carbon fiber, polytetrafluoroethylene and boron nitride.
Claim 7
Dependent Claim
24 words
The method of claim 3, wherein said toner contains 0.01-10 % by weight of metallic oxide having an average particle size of 5-100 mμ.
Claim 8
Dependent Claim
40 words
The method of claim 6, wherein said metallic oxide is at least one selected from the group consisting of hydrophobic silica, hydrophilic silica, titanium oxide, aluminum oxide, cerium oxide, zirconium oxide, cobalt oxide, tin oxide, tantalum oxide and chromium oxide.
Claim 9
Dependent Claim
24 words
The developing apparatus of claim 2, wherein said silicone rubber further contains at least one of inorganic filler, crosslinking agent, thermostabilizer and processing aid.
Claim 10
Dependent Claim
21 words
A method for developing electrostatic latent images with one component type toner using the developing apparatus as claimed in claim 2.
Claim 11
Dependent Claim
21 words
A method for developing electrostatic latent images with one component type toner using the developing apparatus as claimed in claim 4.
Claim 12
Dependent Claim
21 words
A method for developing electrostatic latent images with one component type toner using the developing apparatus as claimed in claim 8.
Claim 13
Dependent Claim
21 words
A method for developing electrostatic latent images with one component type toner using the developing apparatus as claimed in claim 5.
Claim 14
Dependent Claim
19 words
A developing apparatus as claimed in claim 1 in which said movable toner holder is a rotatable developing roller.
Claim 15
Dependent Claim
17 words
A developing apparatus as claimed in claim 1 in which said doctor blade is flexible and planar.
References Cited (Backward Citations)
US4522907A
Cited
US4702964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |