Patent US3620948A successfully refreshed from Google Patents.
US3620948A
Expired / Lapsed
US
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Photoelectrophoretic imaging system employing preliminary electrophoretic disposition of the imaging suspension
Assignee: Xerox Corp
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Filing: 1968-10-03
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Granted: 1971-11-16
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Expires: 1988-10-03
Abstract
Abstract An electrophoretic imaging process is disclosed whereby an useable positive image may be directly produced from negative input. The light-sensitive imaging suspension is electrophoretically introduced into the electrode configuration prior to light exposure in the presence of an electric field.
Inventors
- 👤 Arthur Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:14
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
17 words
The process as disclosed in claim 1 wherein said electrodes are spaced in virtual contact during exposure.
Claim 2
Dependent Claim
22 words
The process as disclosed in claim 1 further including the step of bringing said electrodes into virtual contact while exposing said suspension.
Claim 3
Independent Claim
207 words
A method of photoelectrophoretic imaging comprising electrophoretically depositing an imaging suspension on the surface of a substantially transparent electrode, said suspension comprising a plurality of at least two differently colored finely divided particles in a carrier liquid, each of said particles comprising an electrically photosensitive pigment whose principal light absorption band substantially coincides with its principal photosensitive response, introducing at least one additional electrode, subjecting said suspension to an applied electric field between said electrodes, exposing said suspension to an image through said transparent electrode with a source of activating electromagnetic radiation whereby an image is formed. 5 An electrophoretic imaging process comprising electrophoretically depositing a layer of an imaging suspension on the surface of a substantially transparent electrode, said suspension comprising a plurality of finely divided particles in a substantially insulating carrier liquid each of said particles comprising an electrically photosensitive pigment which is both the primary electrically photosensitive ingredient and the primary colorant for said particle, introducing at least one additional electrode into the system, suBjecting said layer of suspension to an applied electrical field between said electrodes while substantially simultaneously exposing said suspension to a light image through said transparent electrode thereby producing complementary pigment images on the surface of each of said electrodes.
Claim 4
Dependent Claim
29 words
The process as disclosed in claim 5 further including the step of bringing said electrodes together to a spacing of up to about 1 mil while exposing said suspension.
Claim 5
Dependent Claim
109 words
An electrophoretic imaging process comprising electrophoretically depositing a layer of imaging suspension on the surface of a substantially transparent electrode, said suspension comprising a plurality of at least two differently colored finely divided particles in a carrier liquid each of said particles comprising an electrically photosensitive pigment the principal light absorption band of which substantially coincides with its principal photosensitive response, introducing at least one additional electrode into the system, subjecting said layer of suspension to a light image through said transparent electrode, subjecting said layer of suspension to an applied electric field between said electrode thereby producing complementary pigment images on the surfaces of each of said electrodes.
Claim 6
Dependent Claim
133 words
An electrophoretic imaging process comprising electrophoretically depositing a layer of an imaging suspension on the surface of a substantially transparent electrode, said suspension comprising a plurality of finely divided particles in a substantially insulating carrier liquid each of said particles comprising an electrically photosensitive pigment which is both the primary electrically photosensitive ingredient and the primary colorant for said particle, said suspension including cyan colored particles principally photosensitive to red light, magenta colored particles principally photosensitive to green light and yellow colored particles which are principally photosensitive to blue light, providing at least one additional electrode for the system, subjecting said layer of suspension to an applied electrical field between said electrodes, exposing said suspension to a light image through said transparent electrode while sustaining said electrical field whereby an image is formed.
Claim 7
Dependent Claim
77 words
An electrophoretic imaging process comprising the steps of: electrophoretically depositing a layer of an imaging suspension on the surface of a first electrode, said suspension comprising a plurality of electrically photosensitive particles in an electrically insulating carrier, contacting the suspension on the surface of the electrode with at least another electrode, exposing said suspension to an image with activating electromagnetic radiation during contact with at least another electrode, applying an electrical field between said electrodes during imaging.
Claim 8
Dependent Claim
60 words
The process of claim 9 wherein the electrophoretic deposition is accomplished by depositing a layer of suspension on the first electrode and placing a removal electrode across the suspension to remove unwanted particles and applying an electrical field across the suspension between the first electrode and removal electrode whereby particles within the suspension are selectively removed from the first electrode.
Claim 9
Dependent Claim
41 words
The process of claim 9 wherein the electrophoretic deposition is accomplished by passing a suspension depositing electrode across the first electrode and applying an electrical field across the suspension whereby the suspension particles are selectively deposited electrophoretically on the first electrode.
Claim 10
Dependent Claim
17 words
The process of claim 9 wherein the electrophoretic deposition includes applying an electrical field across the suspension.
Claim 11
Dependent Claim
27 words
The process of claim 12 wherein the electrical field applied during electrophoretic deposition is of the same polarity as the polarity of the field applied during imaging.
Claim 12
Dependent Claim
37 words
The process of claim 13 wherein the electrical fields are such that the surface of the first electrode upon whiCh the layer is electrophoretically deposited is positive relative to electrodes interfacing therewith during electrophoretic deposition and imaging.
References Cited (Backward Citations)
US3384566A
Cited
US3427242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |