US3920330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophoretic imaging apparatus
Assignee: Xerox Corp
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Filing: 1974-08-19
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Granted: 1975-11-18
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Expires: 1994-08-19
Abstract
Abstract An electrophoretic imaging process wherein a suspension of particles in a carrier liquid are placed between a photoconductive electrode and a second electrode. With an electrical field applied between the photoconductive electrode and the second electrode the photoconductor is exposed to imagewise radiation which causes particles on the surface of the photoconductive electrode to be driven away in image configuration by charge exchange with the photoconductive electrode. The migrating particles form a negative image on the second electrode leaving a positive image behind on the photoconductive electrode.
Inventors
- 👤 John B Wells
- 👤 Paul C Swanton
- 👤 John W Weigl
- 👤 Edward Forest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:29
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
An imaging apparatus comprising a. a first electrode comprising a photoconductive insulating layer carrying a layer of material capable of transporting at least one species of charge carrier; b. a second electrode; c. a source of D.C. potential for applying an electrical field between said first and second electrodes and across a layer of a suspension of particles in an insulating liquid arranged between said electrodes; and d. projectioN means for exposing said photoconductive insulating layer to a pattern of activating radiation.
Claim 2
Dependent Claim
82 words
An imaging apparatus comprising a. a first electrode comprising a photoconductive insulating layer carrying a layer of material capable of transporting at least one species of charge carrier; b. a second electrode; c. a source of D.C. potential for applying an electrical field between said first and second electrodes and across a layer of a suspension of particles in an insulating liquid arranged between said electrodes; and d. projectioN means for exposing said photoconductive insulating layer to a pattern of activating radiation.
Claim 3
Dependent Claim
20 words
The apparatus as defined in claim 1 wherein said first electrode further includes a substrate for said photoconductive insulating layer.
Claim 4
Dependent Claim
14 words
The apparatus as defined in claim 2 wherein said substrate comprises transparent conductive material.
Claim 5
Dependent Claim
33 words
The apparatus as defined in claim 1 and further including charging means for charging the free surface of a suspension layer prior to placing said suspension layer between said first and second electrodes.
Claim 6
Dependent Claim
17 words
The apparatus as defined in claim 1 wherein said second electrode includes an electrically insulating outer surface.
Claim 7
Dependent Claim
21 words
The apparatus as defined in claim 1 wherein said photoconductive insulating layer has a thickness of up to about 5 microns.
References Cited (Backward Citations)
US3601483A
Cited
US3684683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |