US4745429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing apparatus for an electrostatic photocopier
Assignee: Toshiba Corp
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Filing: 1987-06-25
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Granted: 1988-05-17
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Expires: 2007-06-25
Abstract
Abstract In a developing apparatus for developing an electrostaticlatent image by applying a charged developer to the electrostatic-latent image formed on a surface of an image carrier, a housing which stores the developer and has a developing roller for feeding the developer therefrom to a developing position. A recovering blade for recovering a residual developer on the developer roller in the housing is urged against developer roller. The recovering blade has a conductive portion in contact with the developing roller so as not to non-uniformly or abnormaly triboelectrically charge a developer passing over it into the housing.
Inventors
- 👤 Hideo Mukai
- 👤 Sachiko Yasuda
- 👤 Minoru Yoshida
- 👤 Tomoyuji Asada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0815; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0634; G03G2215/0636
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A developing apparatus for an electrostatic photocopier having an image carrier with an electrostatic latent image on a photosensitive surface thereof, comprising: a housing for containing an electrically chargeable developer; means for electrically charging said developer; means for carrying the charged developer to a developing position exterior to said housing, whereby a portion of said charged developer may develop a latent image; and means for recovering a residual charged developer on said developer carrying means while maintaining a uniform charge on said residual developer, said recovering means comprising means having a conductive portion urged against said developer carrying means.
Claim 2
Dependent Claim
99 words
A developing apparatus for an electrostatic photocopier having an image carrier with an electrostatic latent image on a photosensitive surface thereof, comprising: a housing for containing an electrically chargeable developer; means for electrically charging said developer; means for carrying the charged developer to a developing position exterior to said housing, whereby a portion of said charged developer may develop a latent image; and means for recovering a residual charged developer on said developer carrying means while maintaining a uniform charge on said residual developer, said recovering means comprising means having a conductive portion urged against said developer carrying means.
Claim 3
Dependent Claim
14 words
The apparatus according to claim 1, wherein said recovering means includes a conductive member.
Claim 4
Dependent Claim
39 words
The apparatus according to claim 1, wherein said recovering means comprises an elastic plate including an insulating layer and a conductive layer supported on said insulating layer, wherein said conductive layer is in contact with said developer carrying means.
Claim 5
Dependent Claim
30 words
The apparatus according to claim 1, wherein said developer supplying means comprises a roller positioned in said housing and capable of carrying the developer on an outer peripheral surface thereof.
Claim 6
Dependent Claim
20 words
The apparatus according to claim 1, wherein said developer supplying means has a conductive member formed of conductive rubber material.
Claim 7
Dependent Claim
80 words
A developing apparatus in an electrostatic copier having an image carrier with an electrostatic latent image on a photosensitive surface thereof, comprising: means for developing the latent image on said image carrier; means for forming a thin layer of an electrically charged one-component developer on said developing means; and means for recovering said developer from said developing means while maintaining a uniform charge on said developer, said recovering means comprising means having a conductive portion urged against said developing means.
Claim 8
Dependent Claim
80 words
A developing apparatus in an electrostatic copier having an image carrier with an electrostatic latent image on a photosensitive surface thereof, comprising: means for developing the latent image on said image carrier; means for forming a thin layer of an electrically charged one-component developer on said developing means; and means for recovering said developer from said developing means while maintaining a uniform charge on said developer, said recovering means comprising means having a conductive portion urged against said developing means.
References Cited (Backward Citations)
US4632535A
Cited
US4688923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |