US3596635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic office copier
Assignee: Bell and Howell Co
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Filing: 1967-03-16
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Granted: 1971-08-03
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Expires: 1987-03-16
Abstract
Abstract Apparatus for electrostatographically copying, particularly with the use of copy sheets coated with a photoconductor wherein the photoconductive surface is charged, exposed to form a latent electrostatic image and developed. In the development zone, a copious supply of developer liquid is engaged against the imagebearing surface in close adjacency to an electrode surface. This is accomplished by applying liquid to the peripheral surface of an electrode in the form of a roller, or by the use of an electrode taking the form of a wick having capillary passages formed therein, or by a stationary electrode member having an action surface intersected by plural capillary passages. Liquid developer material is thus applied to only the image-bearing surface to render the latent image visible and utilitarian.
Inventors
- 👤 Louis A Smitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:50
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101; G03G15/22; G03G15/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
In a liquid developer station for applying developer material to a photographic carrier having an electrostatic latent image on one surface thereof; a rotatable developer roller for engaging the image-bearing surface of the carrier; means for applying a film of liquid developer material to the peripheral surface of the developer roller including a tank forming a reservoir for holding a supply of liquid developer, and a weir spaced adjacent said developer roller over which liquid developer flows, a pump having an inlet connected to said reservoir and an outlet discharging to said weir, whereby the liquid flowing over the weir engages the peripheral surface of the developer roller and excess liquid returns gravitationally to the reservoir; means for removing superfluous liquid from the image-bearing surface of the carrier after engagement of said development roller with said image-bearing surface; a transport roller for engaging the opposite side of said carrier and spaced from said developer roller sufficiently to prevent the formation of a liquid split therebetween; and carrier transport means including drive means for driving a carrier between said rollers in the direction of the length of said image-bearing surface.
Claim 2
Dependent Claim
103 words
In a liquid developer station for applying developer liquid to one surface of a sheetform member, a rotatable developer roller having peripheral gear teeth for engaging the said one surface of said sheetform member, means for applying a film of liquid developer material to the peripheral surface of said developer roller before engagement thereof with said sheetform member, and a purging roller having peripheral gear teeth interengaging said gear teeth on said developer roller for purging the surface of said developer roller after engagement thereof with said sheet form member and conditioning said surface to take on a fresh supply of developer liquid.
Claim 3
Dependent Claim
149 words
In a liquid developer station for applyIng developer material to a photographic carrier having an electrostatic latent image on one surface thereof, a rotatable developer roller for engaging the image-bearing surface of the carrier, means for applying a film of liquid developer material to the peripheral surface of the developer roller, means removing superfluous liquid from the image-bearing surface of the carrier after engagement of said development roller with said image-bearing surface, a transport roller for engaging the opposite side of said carrier and spaced from said developer roller sufficiently to prevent the formation of a liquid split therebetween, and drive means for driving a carrier between said rollers in the direction of the length of said image-bearing surface and including means for regulating said developer roller for selectively starting and stopping said developer roller and for coordinating rotation of said roller relative to movement of said copy sheet.
Claim 4
Dependent Claim
206 words
In a liquid developer station for applying developer material to a photographic carrier having an electrostatic latent image on one surface thereof; a rotatable developer roller for engaging the image-bearing surface of the carrier; means for applying a film of liquid developer material to the peripheral surface of the developer roller including a tank forming a reservoir for holding a supply of liquid developer, and a weir spaced adjacent said developer roller over which liquid developer flows, a pump having an inlet connected to said reservoir and an outlet discharging to said weir, whereby the liquid flowing over the weir engages the peripheral surface of the developer roller and excess liquid returns gravitationally to the reservoir; means for adjusting the spacing dimension between the weir and the adjoining surface of said developer roller; means for removing superfluous liquid from the image-bearing surface of the carrier after engagement of said development roller with said image-bearing surface; a transport roller for engaging the opposite side of said carrier and spaced from said developer roller sufficiently to prevent the formation of a liquid split therebetween; and carrier transport means including drive means for driving a carrier between said rollers in the direction of the length of said image-bearing surface.
References Cited (Backward Citations)
US2531036A
Cited
US2858576A
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US3038073A
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GB945980A
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US3276424A
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FR1337297A
Cited
US3367791A
Cited
US3424074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |