US4179209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicolor line screen
Assignee: Xerox Corp
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Filing: 1977-08-03
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Granted: 1979-12-18
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Expires: 1997-08-03
Abstract
Abstract In photoelectrophoretic imaging, a novel multicolor line or cross line filter element and method for maintaining color balance wherein the filter grid comprises a plurality of yellow, cyan and magenta color segments or their complementary colors of controlled varying widths for limiting color interaction in the resulting integrated image.
Inventors
- 👤 Robert N. Goren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:19
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
In a photoelectrophoretic imaging device comprising in combination a blocking electrode; an injecting electrode; inking means for applying a layer of a mono or polychromic photoelectrophoretic ink onto the injection electrode; an imaging station wherein the blocking and injecting electrodes and applied ink are image-wise exposed, while in register, to a light pattern or image; means for applying an electric field across the ink layer at least during image-wise exposure; the improvement comprising a light filtering lattice arranged at the imaging station between the image-wise light pattern and the applied ink layer, said light filtering lattice being geometrically subdivided into repetitive areas of individual light reflective cells of at least three different colors, inclusive of red, green, blue and corresponding complementary colors, thereby forming positive and negative images on the respective electrodes as a plurality of separate but closely proximate loci corresponding to at least each cell of the filter lattice.
Claim 2
Dependent Claim
151 words
In a photoelectrophoretic imaging device comprising in combination a blocking electrode; an injecting electrode; inking means for applying a layer of a mono or polychromic photoelectrophoretic ink onto the injection electrode; an imaging station wherein the blocking and injecting electrodes and applied ink are image-wise exposed, while in register, to a light pattern or image; means for applying an electric field across the ink layer at least during image-wise exposure; the improvement comprising a light filtering lattice arranged at the imaging station between the image-wise light pattern and the applied ink layer, said light filtering lattice being geometrically subdivided into repetitive areas of individual light reflective cells of at least three different colors, inclusive of red, green, blue and corresponding complementary colors, thereby forming positive and negative images on the respective electrodes as a plurality of separate but closely proximate loci corresponding to at least each cell of the filter lattice.
Claim 3
Dependent Claim
17 words
The imaging device of claim 1, wherein the light filtering lattice is incorporated into a light-permeable electrode.
Claim 4
Dependent Claim
39 words
The imaging device of claim 1, wherein the light-filtering lattice is applied as a light-permeable plate, strip, belt or web at least temporarily interposed between and in register with the light pattern source and light-permeable injecting electrode during imaging.
Claim 5
Dependent Claim
27 words
The imaging device of claim 2 wherein the light filtering lattice comprises a fine grid or screen of alternately arranged colored lines, dots, squares, or combination thereof.
Claim 6
Dependent Claim
29 words
The imaging device of claim 3, wherein the light filtering lattice contains one or more fine grids or screens of alternately colored lines, dots, or squares or combination thereof.
Claim 7
Dependent Claim
26 words
The imaging device of claim 1, wherein at least one of the blocking and injecting electrodes is in the form of a web, drum or plate.
Claim 8
Dependent Claim
26 words
The imaging device of claim 2 wherein at least one of the blocking and injecting electrodes is in the form of a web, drum, or plate.
Claim 9
Dependent Claim
26 words
The imaging device of claim 3 wherein at least one of the blocking and injecting electrodes is in the form of a web, drum or plate.
Claim 10
Dependent Claim
25 words
The imaging device of claim 4 wherein one or more of red, blue and green light-reflecting cells within the light-filtering lattice are of unequal area.
Claim 11
Dependent Claim
29 words
The imaging device of claim 4 wherein one or more of cyan, yellow and magenta light-reflecting cells or their complementary colors within the light-filtering lattice are of unequal area.
Claim 12
Dependent Claim
73 words
In a method for improving flexibility, quality and stability of polychromic photoelectrophoretic images obtained by image-wise exposing an imaging device comprising blocking and injecting electrodes and an intermediate polychromic photoelectrophoretic ink while in register in the presence of at least one electric field across the ink layer at an imaging station, the improvement comprising imposing a light filtering lattice as defined in claim 1 between the image source and the applied photoelectrophoretic ink.
Claim 13
Dependent Claim
36 words
A method for improving the quality and stability of polychromic photoelectrophoretic images utilizing a photoelectrophoretic imaging device, comprising imposing a light filtering lattice as defined in claim 2 between the image source and applied photoelectrophoretic ink.
Claim 14
Dependent Claim
36 words
A method for improving the quality and stability of polychromic photoelectrophoretic images utilizing a photoelectrophoretic imaging device, comprising imposing a light filtering lattice as defined in claim 4 between the image source and applied photoelectrophoretic ink.
Claim 15
Dependent Claim
36 words
A method for improving the quality and stability of polychromic photoelectrophoretic images utilizing a photoelectrophoretic imaging device, comprising imposing a light filtering lattice as defined in claim 10 between the image source and applied photoelectrophoretic ink.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |