US3860337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple exposure method and apparatus
Assignee: Xerox Corp
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Filing: 1972-11-21
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Granted: 1975-01-14
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Expires: 1992-11-21
Abstract
Abstract A photoelectrophoretic ink is subjected to light and electric field a plurality of times during a single scanning pass over the ink by a plurality of web electrodes positioned within the boundaries of a narrow slit scanning light image.
Inventors
- 👤 Raymond K Egnaczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:18
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
In an imaging system of the type wherein full frame images are formed from polychromatic photoelectrophoretic ink by scanning said ink with an electric field established in the nip between imaging and transparent electrodes and with a narrow slit light image, the improvement comprising a plurality of closely spaced imaging electrodes positioned within the boundaries of said slit light image wherein each image electrode includes a web forming a nip with the transparent electrode and drive means for moving said webs relative to said transparent electrode in a manner to establish a substantially zero relative velocity between them in the nip during a scanning pass, whereby said ink is exposed to a light image and subjected to electric field a plurality of times during a single scanning pass.
Claim 2
Dependent Claim
128 words
In an imaging system of the type wherein full frame images are formed from polychromatic photoelectrophoretic ink by scanning said ink with an electric field established in the nip between imaging and transparent electrodes and with a narrow slit light image, the improvement comprising a plurality of closely spaced imaging electrodes positioned within the boundaries of said slit light image wherein each image electrode includes a web forming a nip with the transparent electrode and drive means for moving said webs relative to said transparent electrode in a manner to establish a substantially zero relative velocity between them in the nip during a scanning pass, whereby said ink is exposed to a light image and subjected to electric field a plurality of times during a single scanning pass.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1 wherein said imaging electrode webs are wrapped around a small diameter roller to form the nip with the transparent electrode.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein said transparent electrode includes at least a section of a cylinder.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1 wherein said transparent electrode includes a flat plate and said slit light image is formed with apparatus including means to flood with light a narrow region of a full frame opaque original.
Claim 6
Dependent Claim
24 words
The apparatus of claim 1 further including means for coating an imaging electrode web with an electrically insulating liquid prior to entering said nip.
Claim 7
Dependent Claim
44 words
The apparatus of claim 1 wherein said imaging electrodes include continuous loop webs supported between small and large diameter rollers with the small diameter roller, web thickness and electrode spacing being substantially equal to or less than the width of said slit light image.
Claim 8
Dependent Claim
31 words
The apparatus of claim 6 wherein said drive means includes means for coupling a mechanical power source to said large roller for rotating the web around the large and small rollers.
References Cited (Backward Citations)
US3703335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |