US3918402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for developing an electrostatic latent image in electrophotography with a dry developing agent
Assignee: Ricoh Co Ltd
•
Filing: 1973-09-18
•
Granted: 1975-11-11
•
Expires: 1993-09-18
Abstract
Abstract A powder cloud developing section and a brush developing section are disposed along the path of movement of an outer periphery of a drum on which an electrostatic latent image is supported, so that the electrostatic latent image is subjected to powder cloud developing and brush developing consecutively and developed into a visible image.
Inventors
- 👤 Wasaburo Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:06
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0803; G03G15/09; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
163 words
An electrophotographic apparatus for developing an electrostatic latent image with a dry developing agent comprising: a. a movable member having an electrostatic latent image formed on the surface thereof; b. a brush developing section containing a brush developing means comprising: i. a supply of developing agent; and ii. a rotatable brush roller disposed in said supply and adjacent the path of movement of the surface of said movable member for applying said developing agent from said supply to said electrostatic latent image; and c. a powder cloud forming section disposed adjacent said brush developing section upstream along the path of movement of the surface of said movable member and comprising powder cloud forming means for removing the developing agent from said rotating brush roller and scattering it to form a powder cloud for developing said electrostatic latent image, such that the electrostatic latent image is developed into a visible image by powder cloud developing and brush developing to which it is subjected consecutively.
Claim 2
Dependent Claim
163 words
An electrophotographic apparatus for developing an electrostatic latent image with a dry developing agent comprising: a. a movable member having an electrostatic latent image formed on the surface thereof; b. a brush developing section containing a brush developing means comprising: i. a supply of developing agent; and ii. a rotatable brush roller disposed in said supply and adjacent the path of movement of the surface of said movable member for applying said developing agent from said supply to said electrostatic latent image; and c. a powder cloud forming section disposed adjacent said brush developing section upstream along the path of movement of the surface of said movable member and comprising powder cloud forming means for removing the developing agent from said rotating brush roller and scattering it to form a powder cloud for developing said electrostatic latent image, such that the electrostatic latent image is developed into a visible image by powder cloud developing and brush developing to which it is subjected consecutively.
Claim 3
Dependent Claim
51 words
An apparatus according to claim 1 wherein said rotatable brush roller comprises a cylinder and magnetic means mounted within said cylinder and relatively rotatable therewith for forming a magnetic brush on the surface of said cylinder from said developing agent and for causing the magnetic brush to rotate around said cylinder.
Claim 4
Dependent Claim
34 words
An apparatus according to claim 2 wherein said powder cloud forming means comprises a wire netting serving as an opposite electrode for promoting the supply of the developing agent to the elEctrostatic latent image.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 2 wherein said powder cloud forming means comprises air-blast nozzles for scattering the developing agent.
Claim 6
Dependent Claim
37 words
An apparatus according to claim 2 wherein said powder cloud forming means comprises a second brush roller for scattering the developing agent, and wires for removing the developing agent from the brush of the second brush roller.
Claim 7
Dependent Claim
14 words
An apparatus according to claim 2 wherein said movable member comprises a rotating drum.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 2 wherein said magnetic means is fixed with respect to said brush developing section and said cylinder is rotated relatively thereto.
Claim 9
Dependent Claim
57 words
An apparatus according to claim 7 wherein said powder cloud forming means comprises a number of fins mounted on the outer periphery of said cylinder for throwing the developing agent out of the outer periphery of the cylinder, and a baffle plate for scattering the developing agent thrown out of the cylinder toward the powder developing section.
References Cited (Backward Citations)
US2732775A
Cited
US3040704A
Cited
US3375807A
Cited
US3363555A
Cited
US3543720A
Cited
US3670701A
Cited
US3682678A
Cited
US3707390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |