US4990958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reload member for a single component development housing
Assignee: Xerox Corp
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Filing: 1989-12-26
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Granted: 1991-02-05
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Expires: 2009-12-26
Abstract
Abstract A single component development system utilizing insulative nonmagnetic toner. A toner mover transports toner from a supply of toner for transfer to a donor roll from which it is deposited on to latent electrostatic images contained on an imaging surface. An electrically biased flap of conductive material is supported for rubbing contact with the surface of the toner mover. Supporting the electrically biased, conductive flap in rubbing contact with the toner mover results in effective reloading of the doner roll notwithstanding the presence a high stress condition such as the requirement for developing images containing conditnuous solid areas.
Inventors
- 👤 Grace T. Brewington
- 👤 John M. Scharr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:16
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0808; G03G15/0803; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0619; G03G2215/0634; G03G2215/0636; G03G2215/0643
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
Apparatus for developing latent electrostatic images on a charge retentive surface with developer comprising toner, said apparatus comprising: a donor structure for depositing toner on said charge retentive surface; a toner mover supported for movement through a supply of toner to thereby stir up said toner; means for establishing an electrostatic field between said donor structure and said toner mover for effecting toning of said donor structure with the stirred up toner; means contacting said toner mover for enabling reloading of said donor roll structure in a single revolution thereof notwithstanding the presence of a high stress development condition.
Claim 2
Dependent Claim
99 words
Apparatus for developing latent electrostatic images on a charge retentive surface with developer comprising toner, said apparatus comprising: a donor structure for depositing toner on said charge retentive surface; a toner mover supported for movement through a supply of toner to thereby stir up said toner; means for establishing an electrostatic field between said donor structure and said toner mover for effecting toning of said donor structure with the stirred up toner; means contacting said toner mover for enabling reloading of said donor roll structure in a single revolution thereof notwithstanding the presence of a high stress development condition.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 wherein said means contacting said toner mover comprises means for preventing toner build-up on the surface of said toner mover.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 3 wherein said means for preventing toner build-up comprises means for removing residual toner from the surface of said toner mover.
Claim 5
Dependent Claim
23 words
Apparatus according to claim 3 wherein said means for removing residual toner comprises a flap supported for wiping engagement with said toner mover.
Claim 6
Dependent Claim
11 words
Apparatus according to claim 4 wherein said flap is electrically conductive.
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |