Patent US349146A successfully refreshed from Google Patents.
US5010367A
Expired / Lapsed
US
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Dual AC development system for controlling the spacing of a toner cloud
Assignee: Xerox Corp
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Filing: 1989-12-11
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Granted: 1991-04-23
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Expires: 2009-12-11
Abstract
Abstract A scavengeless/non-interactive development system for use in highlight color imaging. To control the developability of lines and the degree of interaction between the toner and receiver, the combination of an AC voltage on a developer donor roll with an AC voltage between toner cloud forming wires and donor roll enables efficient detachment of toner from the donor to form a toner cloud and position one end of the cloud in close proximity to the image receiver for optimum development of lines and solid areas without scavenging a previously toned image.
Inventors
- 👤 Dan A. Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0803; G03G15/0806; G03G15/0813; G03G2215/00; G03G2215/06; G03G2215/0634; G03G2215/0636; G03G2215/0643
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
97 words
Apparatus for forming images on an image receiving surface with developer, said apparatus comprising: a supply of developer; means for transporting developer from said supply to an area adjacent said image receiving surface; means for forming transported developer into a cloud of marking particles; means for controlling the spacing of said marking particle cloud relative to said image receiver without interacting with said image receiving surface; and means for establishing a development field between said transporting means and said image receiving surface for causing an image on said image receiving surface to be developed with marking particles.
Claim 2
Dependent Claim
97 words
Apparatus for forming images on an image receiving surface with developer, said apparatus comprising: a supply of developer; means for transporting developer from said supply to an area adjacent said image receiving surface; means for forming transported developer into a cloud of marking particles; means for controlling the spacing of said marking particle cloud relative to said image receiver without interacting with said image receiving surface; and means for establishing a development field between said transporting means and said image receiving surface for causing an image on said image receiving surface to be developed with marking particles.
Claim 3
Dependent Claim
34 words
Apparatus according to claim 1 wherein said means for controlling the spacing of said marking particle cloud comprises an AC bias voltage applied between said means for transporting developer and said image receiving surface.
Claim 4
Dependent Claim
26 words
Apparatus according to claim 2 wherein said means for forming transported developer into a cloud is disposed between said transporting means and said image receiving surface.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 3 wherein said means for forming transported developer into a cloud comprises an electrode structure.
Claim 6
Dependent Claim
26 words
Apparatus according to claim 3 wherein said means for forming transported developer into a cloud further comprises an AC bias voltage applied to said electrode structure.
Claim 7
Dependent Claim
14 words
Apparatus according to claim 5 wherein said AC bias voltages have a different magnitude.
Claim 8
Dependent Claim
34 words
Apparatus according to claim 6 wherein the AC bias voltage applied between said image receiving surface and said transporting means is out of phase with the AC bias voltage applied to said electrode structure.
Claim 9
Dependent Claim
16 words
Apparatus according to claim 7 including means for forming tri-level images on said image receiving surface.
Claim 10
Dependent Claim
29 words
Apparatus according to claim 8 including means for forming said tri-level images in a single pass of said images receiving surface past process stations used in forming said images.
Claim 11
Dependent Claim
14 words
Apparatus according to claim 9 wherein said supply of developer comprises single component developer.
Claim 12
Dependent Claim
13 words
Apparatus according to claim 10 wherein said transporting means comprises a donor roll.
Claim 13
Dependent Claim
45 words
Apparatus according to claim 11 wherein said supply of developer, said transporting means, said means for forming and said means for controlling comprise a first developer apparatus and wherein said apparatus for forming images further includes a second developer apparatus including another supply of developer.
Claim 14
Dependent Claim
17 words
Apparatus according to claim 12 wherein said tri-level images comprise two image areas and a background area.
Claim 15
Dependent Claim
35 words
Apparatus according to claim 13 wherein said developer supply is utilized for developing one of said two images and said another of said developer supplies is utilized for developing the other of said two images.
Claim 16
Dependent Claim
14 words
Apparatus according to claim 9 wherein said supply of developer comprises two component developer.
Claim 17
Dependent Claim
25 words
Apparatus according to claim 2 wherein said means for forming transported developer, into a cloud further comprises an AC bias voltage applied to transporting means.
Claim 18
Dependent Claim
100 words
In a method for forming images on an image receiving surface with developer, the steps including: providing a supply of developer; transporting developer from said supply to an area adjacent said image receiving surface; forming transported developer into a cloud of marking particles; controlling the spacing of said marking particle cloud relative to said image receiver without touching said image receiving surface, said controlling step being independent of said forming step; and establishing a development field between said transporting means and said image receiving surface for causing an image on said image receiving surface to be developed with marking particles.
Claim 19
Dependent Claim
100 words
In a method for forming images on an image receiving surface with developer, the steps including: providing a supply of developer; transporting developer from said supply to an area adjacent said image receiving surface; forming transported developer into a cloud of marking particles; controlling the spacing of said marking particle cloud relative to said image receiver without touching said image receiving surface, said controlling step being independent of said forming step; and establishing a development field between said transporting means and said image receiving surface for causing an image on said image receiving surface to be developed with marking particles.
Claim 20
Dependent Claim
32 words
The method according to claim 17 wherein step of controlling the spacing of said marking particle cloud includes applying an AC bias voltage between a developer transport and said image receiving surface.
Claim 21
Dependent Claim
27 words
The method according to claim 18 wherein said step of forming transported developer into a cloud is effected by applying an AC bias to said developer transport.
Claim 22
Dependent Claim
30 words
The method according to claim 18 wherein said step of forming transported developer into a cloud is effected by means disposed between said developer transport and said image receiving surface.
Claim 23
Dependent Claim
23 words
The method according to claim 20 wherein said means disposed between said developer transport and said image receiving surface comprises an electrode structure.
Claim 24
Dependent Claim
29 words
The method according to claim 21 wherein said means disposed between said developer transport and said image receiving surface comprises an AC bias voltage applied to said electrode structure.
Claim 25
Dependent Claim
15 words
The method according to claim 22 wherein said AC bias voltages have a different magnitude.
Claim 26
Dependent Claim
35 words
The method according to claim 23 wherein the AC bias voltage applied between said image receiving surface and said developer transport is out of phase with the AC bias voltage applied to said electrode structure.
Claim 27
Dependent Claim
18 words
The method according to claim 24 including the step of forming tri-level images on said image receiving surface.
Claim 28
Dependent Claim
29 words
The method according to claim 25 said tri-level images are formed in a single pass of said image receiving surface past the processing stations used in forming said images.
Claim 29
Dependent Claim
15 words
The method according to claim 26 wherein said supply of developer comprises two component developer.
Claim 30
Dependent Claim
15 words
The method according to claim 26 wherein said supply of developer comprises single component developer.
Claim 31
Dependent Claim
14 words
The method according to claim 28 wherein said developer transport comprises a donor roll.
Claim 32
Dependent Claim
41 words
The method according to claim 29 wherein said steps of providing, transporting, forming and controlling comprise steps for developing an image and wherein said method of forming images further includes another method including another supply of developer for developing an image.
Claim 33
Dependent Claim
18 words
The method according to claim 30 wherein said tri-level images comprise two images areas and a background area.
Claim 34
Dependent Claim
36 words
The method according to claim 31 wherein said developer supply is utilized for developing one of said two images and said another of said developer supplies is utilized for developing the other of said two images.
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |