Patent US4826747A successfully refreshed from Google Patents.
US4826747A
Expired / Lapsed
US
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Electrophotographic method uses toner of special size relative to exposure light beam
Assignee: Ricoh Co Ltd
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Filing: 1987-09-23
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Granted: 1989-05-02
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Expires: 2007-09-23
Abstract
Abstract An electrophotographic method is disclosed, in which electrostatic latent images are formed on an electrophotographic photoconductor by exposure of the photoconductor to a light beam, and the formed electrostatic latent images are developed to visible toner images by a developer comprising toner particles, with the minimum diameter D of the light spot of the light beam on the photoconductor and the volume mean diameter X w of the toner particles being in the relationship of (D)μm≧9.0×(X w )μm-34.
Inventors
- 👤 Shunichi Chiba
- 👤 Satoru Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:29
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G13/01; G03G13/013; G03G9/00; G03G9/08; G03G9/0819; G03G9/097; G03G9/09708; G03G9/09725; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
An electrophotographic method of forming electrostatic latent images on a uniformly electrically charged electrophotographic photoconductor by exposure of the photoconductor to a light beam, and developing the formed electrostatic latent images to visible toner images by a developer comprising toner particles, with the minimum diameter D of the light spot of said light beam on said photoconductor and the volume mean diameter X w of said toner particles being in the relationship of (D) μm≧9.0×(X w ) μm-34.
Claim 2
Dependent Claim
78 words
An electrophotographic method of forming electrostatic latent images on a uniformly electrically charged electrophotographic photoconductor by exposure of the photoconductor to a light beam, and developing the formed electrostatic latent images to visible toner images by a developer comprising toner particles, with the minimum diameter D of the light spot of said light beam on said photoconductor and the volume mean diameter X w of said toner particles being in the relationship of (D) μm≧9.0×(X w ) μm-34.
Claim 3
Dependent Claim
19 words
The electrophotographic method as claimed in claim 1, wherein said visible toner images are transferred to a transfer sheet.
Claim 4
Dependent Claim
16 words
The electrophotographic method as claimed in claim 1, wherein said visible toner images are full-color images.
Claim 5
Dependent Claim
31 words
The electrophotographic method as claimed in claim 3, wherein said full-color images are formed by superimposing any of a cyan toner, a magenta toner, a yellow toner and a black toner.
Claim 6
Dependent Claim
22 words
The electrophotographic method as claimed in claim 1, wherein the surface of said toner particles is covered with a fluidity improvement agent.
Claim 7
Dependent Claim
36 words
The electrophotographic method as claimed in claim 5, wherein said fluidity improvement agent is selected from the group consisting of TiO 2 , Al 2 O 3 and SiO 2 in the form of finely-divided particles.
Claim 8
Dependent Claim
35 words
The electrophotographic method as claimed in claim 1, wherein said developer is a two-component developer comprising said toner particles and carrier particles having a particle size larger than the particle size of said toner particles.
Claim 9
Dependent Claim
29 words
The electrophotographic method as claimed in claim 7, wherein said carrier particles are finely-divided particles of iron, nickel, ferrite, magnetite, glass beads, resin coated metal particles or metal oxides.
Claim 10
Dependent Claim
22 words
The electrophotographic method as claimed in claim 8, wherein carrier particles have a particle size ranging from 50 μm to 300 μm.
References Cited (Backward Citations)
US4220698A
Cited
US4515879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |