US3879121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer system
Assignee: International Business Machines Corp
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Filing: 1973-12-13
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Granted: 1975-04-22
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Expires: 1993-12-13
Abstract
Abstract A xerographic image is transferred to a support sheet by a field created by an electrode that presses the support sheet against the image it is to receive. An insulating layer on the electrode prevents the transfer of charge from the field source to the support sheet. Discharge means is provided to remove charge collected on the contacting side of the electrode to maintain full field strength and further prevent delivery of charge to the support sheet. With this transfer system, several good quality copies can be produced by a single electrostatic latent image that is redeveloped following each transfer operation.
Inventors
- 👤 Henry Wellington Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/168; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
An electrostatic printer of the type having an imaging surface on which an electrostatic image can be impressed and a physical image developed thereon with marking material bearing an electrostatic charge of a first polarity, transfer means cooperable with said imaging surface and with image support material for transferring at least a portion of said physical image from said imaging surface to said image support material, said transfer means including movable and yieldable cylindrical means having an outer surface for pressing said image support material into contiguous relation with said imaging surface and the physical image thereon, said outer surface being formed of a thin dielectric material to provide a current flow barrier layer, and transfer electrostatic field applying means positioned opposite the region of said contiguous relation, wherin the improvement comprises: electrical conductor means contacting said dielectric material at a location displaced from said region of contiguous relation and providing a conductive path for periodically removing charge from said outer surface of said yieldable cylindrical means.
Claim 2
Dependent Claim
167 words
An electrostatic printer of the type having an imaging surface on which an electrostatic image can be impressed and a physical image developed thereon with marking material bearing an electrostatic charge of a first polarity, transfer means cooperable with said imaging surface and with image support material for transferring at least a portion of said physical image from said imaging surface to said image support material, said transfer means including movable and yieldable cylindrical means having an outer surface for pressing said image support material into contiguous relation with said imaging surface and the physical image thereon, said outer surface being formed of a thin dielectric material to provide a current flow barrier layer, and transfer electrostatic field applying means positioned opposite the region of said contiguous relation, wherin the improvement comprises: electrical conductor means contacting said dielectric material at a location displaced from said region of contiguous relation and providing a conductive path for periodically removing charge from said outer surface of said yieldable cylindrical means.
Claim 3
Dependent Claim
167 words
An electrostatic printer of the type having an imaging surface on which an electrostatic image can be impressed and a physical image developed thereon with marking material bearing an electrostatic charge of a first polarity, transfer means cooperable with said imaging surface and with image support material for transferring at least a portion of said physical image from said imaging surface to said image support material, said transfer means including movable and yieldable cylindrical means having an outer surface for pressing said image support material into contiguous relation with said imaging surface and the physical image thereon, said outer surface being formed of a thin dielectric material to provide a current flow barrier layer, and transfer electrostatic field applying means positioned opposite the region of said contiguous relation, wherin the improvement comprises: electrical conductor means contacting said dielectric material at a location displaced from said region of contiguous relation and providing a conductive path for periodically removing charge from said outer surface of said yieldable cylindrical means.
Claim 4
Dependent Claim
167 words
An electrostatic printer of the type having an imaging surface on which an electrostatic image can be impressed and a physical image developed thereon with marking material bearing an electrostatic charge of a first polarity, transfer means cooperable with said imaging surface and with image support material for transferring at least a portion of said physical image from said imaging surface to said image support material, said transfer means including movable and yieldable cylindrical means having an outer surface for pressing said image support material into contiguous relation with said imaging surface and the physical image thereon, said outer surface being formed of a thin dielectric material to provide a current flow barrier layer, and transfer electrostatic field applying means positioned opposite the region of said contiguous relation, wherin the improvement comprises: electrical conductor means contacting said dielectric material at a location displaced from said region of contiguous relation and providing a conductive path for periodically removing charge from said outer surface of said yieldable cylindrical means.
Claim 5
Dependent Claim
75 words
An electrostatic printer as defined in claim 1 wherein said transfer field applying means comprises means defining a ground plate behind said imaging surface, and a body of conductive material positioned opposite said region of contiguous relation and a source of electrical potential operatively connected to said body of conductive material and said means defining a ground plate, wherein the improvement further comprises: means connecting said source of electrical potential to said electrical conductor mEans.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |