Patent US4144061A successfully refreshed from Google Patents.
US4144061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer development using a fluid spaced donor member
Assignee: Xerox Corp
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Filing: 1977-06-27
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Granted: 1979-03-13
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Expires: 1997-06-27
Abstract
Abstract Fluid spaced transfer development of electrostatic images is achieved by using a developer donor, the surface of which has perforations that permit the passage of fluid pressure therethrough. The fluid pressure impinges against an imaging surface in order to maintain a uniform spaced relationship between the donor and the imaging surface.
Inventors
- 👤 Lloyd F. Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0813
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
In an electrostatographic imaging process, which comprises forming an electrostatic latent image on an imaging surface, distributing toner material on the surface of a donor member, and developing said image by electrostatically transferring the toner material to said image from the surface of the donor member maintained in close proximity to the imaging surface: the improvement comprising maintaining the donor member surface at a uniform spaced relationship to the imaging surface by applying fluid pressure through perforations in the donor member against the imaging surface.
Claim 2
Dependent Claim
85 words
In an electrostatographic imaging process, which comprises forming an electrostatic latent image on an imaging surface, distributing toner material on the surface of a donor member, and developing said image by electrostatically transferring the toner material to said image from the surface of the donor member maintained in close proximity to the imaging surface: the improvement comprising maintaining the donor member surface at a uniform spaced relationship to the imaging surface by applying fluid pressure through perforations in the donor member against the imaging surface.
Claim 3
Dependent Claim
87 words
In an electrostatographic imaging process, which comprises, forming an electrostatic latent image on an imaging surface, distributing toner material on the surface of a donor member, and developing said image by electrostatically transferring the toner material to said image from the surface of the donor member maintained in close proximity to the imaging surface: the improvement wherein the donor member surface is maintained at a uniform spaced relationship to the imaging surface by providing fluid pressure through perforations in the imaging surface against the donor member surface.
Claim 4
Dependent Claim
87 words
In an electrostatographic imaging process, which comprises, forming an electrostatic latent image on an imaging surface, distributing toner material on the surface of a donor member, and developing said image by electrostatically transferring the toner material to said image from the surface of the donor member maintained in close proximity to the imaging surface: the improvement wherein the donor member surface is maintained at a uniform spaced relationship to the imaging surface by providing fluid pressure through perforations in the imaging surface against the donor member surface.
Claim 5
Dependent Claim
84 words
In an electrostatographic imaging apparatus, comprising, an imaging member with a surface capable of retaining an electrostatic latent image, a donor member with a surface capable of supporting a layer of particulate image developing material, and means for spacing said imaging member from said donor member; the improvement wherein said means for spacing said imaging member from said donor member includes perforations in said imaging member surface and a fluid pressure source for applying fluid pressure through the perforation and against said donor member.
Claim 6
Dependent Claim
84 words
In an electrostatographic imaging apparatus, comprising, an imaging member with a surface capable of retaining an electrostatic latent image, a donor member with a surface capable of supporting a layer of particulate image developing material, and means for spacing said imaging member from said donor member; the improvement wherein said means for spacing said imaging member from said donor member includes perforations in said imaging member surface and a fluid pressure source for applying fluid pressure through the perforation and against said donor member.
Claim 7
Dependent Claim
19 words
The improvement of claim 3 including means for varying the spacing between said imaging member and said donor member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |