US3854813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing apparatus using charge induced toning
Assignee: Individual
•
Filing: 1973-09-10
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Granted: 1974-12-17
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Expires: 1993-09-10
Abstract
Abstract A source of electrostatic charges comprising a latent electrostatic image is brought into close proximity to a record member having one face of the said record member wetted by a liquid toner. The toner is in contact with both the electrostatic charge source and the record member for an interval during which a latent charge of opposite sign is induced in the record member and the toner particles in the liquid toner are driven by the field lines established between the electrostatic charge source and the induced charge on the record member to form a visible image on the record member.
Inventors
- 👤 A Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/06; G03G15/10; G03G15/101; G03G15/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
182 words
An electrostatic printing apparatus comprising a housing, a latent charge image receiving member within said housing, means to create a latent charge image upon the latent charge image receiving member, a source of sheet-like record material, a source of liquid toner, means to (wet) apply a thin film of said toner to at least one major surface of the record material (with the liquid toner), feed means to bring the latent image bearing member and record member together in an initially gapped relationship with one wetted surfaced of the record member facing a surface of the latent image bearing member, means to transport the said wetted record member and latent image bearing member synchronously and along a converging path with the liquid toner on the record member in contact with the surface of the latent image bearing member until an image is induced in the record member and a visible image is formed upon the record member by the said toner and means adjacent the end of said converging path for separating the toned record member from the latent image bearing member.
Claim 2
Dependent Claim
182 words
An electrostatic printing apparatus comprising a housing, a latent charge image receiving member within said housing, means to create a latent charge image upon the latent charge image receiving member, a source of sheet-like record material, a source of liquid toner, means to (wet) apply a thin film of said toner to at least one major surface of the record material (with the liquid toner), feed means to bring the latent image bearing member and record member together in an initially gapped relationship with one wetted surfaced of the record member facing a surface of the latent image bearing member, means to transport the said wetted record member and latent image bearing member synchronously and along a converging path with the liquid toner on the record member in contact with the surface of the latent image bearing member until an image is induced in the record member and a visible image is formed upon the record member by the said toner and means adjacent the end of said converging path for separating the toned record member from the latent image bearing member.
Claim 3
Dependent Claim
26 words
An electrostatic printing apparatus according to claim 1 in which the latent charge image receiving member is an elongated support having a photoconcuctive insulative layer thereon.
Claim 4
Dependent Claim
36 words
An electrostatic printing apparatus according to claim 2 in which the support is a continuous strip of flexible material having an electrically conductive surface and a layer of a photoconductive material carried on said conductive surface.
Claim 5
Dependent Claim
20 words
An electrostatic printing apparatus according to claim 3 in which the pHotoconductive material is a zinc oxide in resin layer.
Claim 6
Dependent Claim
24 words
An electrostatic printing apparatus according to claim 1 in which the latent image bearing member is a highly insulative strip on a conductive backing.
Claim 7
Dependent Claim
19 words
An electrostatic printing apparatus according to claim 1 in which the latent image bearing member is a cylindrical drum.
Claim 8
Dependent Claim
31 words
An electrostatic printing apparatus according to claim 6 in which the surface of the drum is formed of electrically conductive material upon which there is carried a layer of photoconductive material.
Claim 9
Dependent Claim
15 words
An electrostatic printing apparatus according to claim 7 in which the photoconductive material is selenium.
Claim 10
Dependent Claim
40 words
An electrostatic printing apparatus according to claim 6 in which the latent charge image creating means comprises means to uniformly charge the charge image receiving surface of the drum and means to direct an aerial image upon said uniform charge.
Claim 11
Dependent Claim
52 words
An electrostatic printing apparatus according to claim 1 in which the feed means to bring the latent image bearing member and the record member together includes at least one roller closely adjacent the latent image bearing member and disposed so as to direct the record member toward the latent image bearing member.
Claim 12
Dependent Claim
30 words
An electrostatic printing apparatus according to claim 10 in which the roller is separated from the latent image bearing surface a distance of the order of one-sixteenth to one-eighth inch.
Claim 13
Dependent Claim
42 words
An electrostatic printing apparatus according to claim 10 in which the feed means includes a pair of squeegee rollers disposed at the end of the synchronous travel path of the latent image bearing member and record member and before the separating means.
Claim 14
Dependent Claim
26 words
An electrostatic printing apparatus according to claim 12 in which the squeegee rollers are disposed on either side of the record member following the separating means.
Claim 15
Dependent Claim
49 words
An electrostatic printing apparatus according to claim 1 in which the transport means directs the wetted record member and the latent image bearing member upwardly and along a non-vertical path whereby the liquid toner flows, between the record member and the facing surface of the latent image bearing member.
Claim 16
Dependent Claim
15 words
An electrostatic printing apparatus according to claim 14 in which the non-vertical path is sloping.
Claim 17
Dependent Claim
15 words
An electrostatic printing apparatus according to claim 14 in which the non-vertical path is curvilinear.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |