Patent US4792512A successfully refreshed from Google Patents.
US4792512A
Expired / Lapsed
US
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Method of developing electrostatic images using two component developer and AC charging
Assignee: Konica Minolta Inc
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Filing: 1987-06-19
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Granted: 1988-12-20
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Expires: 2007-06-19
Abstract
Abstract A charging method of an electrostatic image developer which makes it possible to electrically charge an insulating one-component developer or a two-component developer consisting of a toner and a carrier to a desired charged state and which comprises introducing the developer into a charging space between a pair of sheet-like charging members opposing each other in which space an alternating field is formed, and oscillating the developer by means of the alternating field for charging it. A developing method of a non-contact or contact system which develops the electrostatic image by use of the developer charged electrically by the above-mentioned charging method.
Inventors
- 👤 Satoshi Haneda
- 👤 Takashi Itoh
- 👤 Ken Nakamura
- 👤 Makoto Tomono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0907; G03G15/065; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A method for developing an electrostatic latent image on the surface of an electrostatic image support member which comprises: (i) forming an electrostatic latent image on said surface of the electric image support member, (ii) transferring electrostatically charged developer which comprises a toner and a magnetic carrier which is coated with an insulating resin on the surface of a developer transfer member into a developing region by the relative movement between a magnet positioned in said developer transfer member and said developer transfer member, and (iii) applying an a.c. field between said electrostatic image support member and said developer transfer member so as to develop said electrostatic latent image in accordance with a non-contact developing system.
Claim 2
Independent Claim
116 words
A method for developing an electrostatic latent image on the surface of an electrostatic image support member which comprises: (i) forming an electrostatic latent image on said surface of the electric image support member, (ii) transferring electrostatically charged developer which comprises a toner and a magnetic carrier which is coated with an insulating resin on the surface of a developer transfer member into a developing region by the relative movement between a magnet positioned in said developer transfer member and said developer transfer member, and (iii) applying an a.c. field between said electrostatic image support member and said developer transfer member so as to develop said electrostatic latent image in accordance with a non-contact developing system.
Claim 3
Dependent Claim
55 words
A method for developing an electrostatic latent image of claim 1, wherein said developer transfer member is arranged in relation to said electrostatic image support member so as to have a clearance between said surface of the electrostatic image support member and top of the developer layer on the surface of said developer transfer member.
Claim 4
Dependent Claim
18 words
A method for developing an electrostatic latent image of claim 1 wherein said toner is an insulating toner.
Claim 5
Dependent Claim
18 words
A method for developing an electrostatic latent image of claim 1, wherein said carrier is an insulating carrier.
Claim 6
Dependent Claim
23 words
A method for developing an electrostatic latent image of claim 1, wherein the step of applying a.c. field comprises superposing a d.c. field.
Claim 7
Dependent Claim
21 words
A method for developing an electrostatic latent image of claim 1, wherein said magnet is arranged so as to be rotatable.
Claim 8
Dependent Claim
21 words
A method for developing an electrostatic latent image of claim 2 wherein said magnet is arranged so as to be rotatable.
Claim 9
Dependent Claim
21 words
A method for developing an electrostatic latent image of claim 5 wherein said magnet is arranged so as to be rotatable.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |