Patent US4420244A successfully refreshed from Google Patents.
US4420244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for developing latent electrostatic images for gap transfer to a carrier sheet
Assignee: HP Indigo BV
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Filing: 1982-10-12
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Granted: 1983-12-13
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Expires: 2002-10-12
Abstract
Abstract Electrophotographic copying apparatus for use with a composition containing spacing particles to provide a gap between the developed image on the photoconductor and the carrier sheet to which the image is transferred, in which a reverse roller reduces the excess liquid on the developed image before transfer, which reverse roller is a metering device biased to a potential greater than the non-image areas of the developed image. The bias on the metering device impresses a potential of opposite polarity to the polarity of the toner particles to hold the toner particles forming the developed image on the photoconductor.
Inventors
- 👤 Benzion Landa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
An electrophotographic apparatus including in combination a photoconductor; means for moving said photoconductor past a corona charging station for imparting a charge of a certain polarity to the surface of said photoconductor; an imaging station; a developing station, said developing station including means for applying a developing liquid to said photoconductor, which developing liquid comprises a dielectric carrier liquid, toner particles, and spacing particles having a dielectric constant higher than the dielectric constant of said carrier liquid; a metering station; and a transfer station in succession; said metering station comprising metering means, means for mounting said metering means adjacent to the surface of the photoconductor, means for impressing a bias on said metering means of the same polarity as the charge on said photoconductor; and means for spacing a carrier sheet to which the developed image is to be transferred from the surface of the photoconductor; said spacing means comprising said spacing particles and means for positioning said carrier sheet at said transfer station.
Claim 2
Dependent Claim
164 words
An electrophotographic apparatus including in combination a photoconductor; means for moving said photoconductor past a corona charging station for imparting a charge of a certain polarity to the surface of said photoconductor; an imaging station; a developing station, said developing station including means for applying a developing liquid to said photoconductor, which developing liquid comprises a dielectric carrier liquid, toner particles, and spacing particles having a dielectric constant higher than the dielectric constant of said carrier liquid; a metering station; and a transfer station in succession; said metering station comprising metering means, means for mounting said metering means adjacent to the surface of the photoconductor, means for impressing a bias on said metering means of the same polarity as the charge on said photoconductor; and means for spacing a carrier sheet to which the developed image is to be transferred from the surface of the photoconductor; said spacing means comprising said spacing particles and means for positioning said carrier sheet at said transfer station.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |