Patent US4587527A successfully refreshed from Google Patents.
US4587527A
Expired / Lapsed
US
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Charging electrodes bearing a doped semiconductor coating
Assignee: Kodak Versamark Inc
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Filing: 1985-08-05
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Granted: 1986-05-06
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Expires: 2005-08-05
Abstract
Abstract There is described an array of charging electrodes such as are used in ink jet printers. At least portions of the exposed surfaces of such electrodes, used to charge passing ink drops, are overcoated with a continuous coating substantially free of cracks of a semiconductive material doped to have a resistance, at room temperature, when measured transverse to the electrode, of between 10 8 and 10 11 ohms, such material being essentially insoluble in the ink.
Inventors
- 👤 Walter L. Schutrum
- 👤 Hilarion Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:27
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/075; B41J2/08; B41J2/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
An array of charging electrodes for use in an ink jet printer, comprising a dielectric body and a plurality of said charging electrodes formed within said dielectric body so as to expose said electrodes at a surface of said body to ink drops passing nearby, the improvement wherein each of said exposed electrodes is at least partially overcoated with a continuous coating substantially free of cracks of a semiconductive material doped to have a resistance, at room temperature, when measured transverse to the electrode, of between about 10 8 and about 10 11 ohm, said material having essentially no solubility in ink, whereby the electrodes where overcoated (a) are protected from contact with stray ink, and (b) leak off surface charges on said continuous coating to said electrodes.
Claim 2
Dependent Claim
128 words
An array of charging electrodes for use in an ink jet printer, comprising a dielectric body and a plurality of said charging electrodes formed within said dielectric body so as to expose said electrodes at a surface of said body to ink drops passing nearby, the improvement wherein each of said exposed electrodes is at least partially overcoated with a continuous coating substantially free of cracks of a semiconductive material doped to have a resistance, at room temperature, when measured transverse to the electrode, of between about 10 8 and about 10 11 ohm, said material having essentially no solubility in ink, whereby the electrodes where overcoated (a) are protected from contact with stray ink, and (b) leak off surface charges on said continuous coating to said electrodes.
Claim 3
Dependent Claim
125 words
An array of charging electrodes for use in an ink jet printer, comprising a dielectric body and a plurality of said charging electrodes formed within said dielectric body so as to expose said electrodes at a surface of said body to ink drops passing nearby, the improvement wherein each of said exposed electrodes is at least partially overcoated with a continuous coating of an amorphous semiconductive material doped to have a resistance, at room temperature, when measured transverse to the electrode, of between about 10 8 and about 10 11 ohm, said material having essentially no solubility in ink, whereby the electrodes where overcoated (a) are protected from contact with stray ink, and (b) leak off surface charges on said continuous coating to said electrodes.
Claim 4
Dependent Claim
125 words
An array of charging electrodes for use in an ink jet printer, comprising a dielectric body and a plurality of said charging electrodes formed within said dielectric body so as to expose said electrodes at a surface of said body to ink drops passing nearby, the improvement wherein each of said exposed electrodes is at least partially overcoated with a continuous coating of an amorphous semiconductive material doped to have a resistance, at room temperature, when measured transverse to the electrode, of between about 10 8 and about 10 11 ohm, said material having essentially no solubility in ink, whereby the electrodes where overcoated (a) are protected from contact with stray ink, and (b) leak off surface charges on said continuous coating to said electrodes.
Claim 5
Dependent Claim
27 words
An array of charging electrodes as define in claim 1 or 2, wherein said electrodes are shaped to have a topological order of connectivity equal to zero.
Claim 6
Dependent Claim
27 words
An array of charging electrodes as defined in claim 1 or 2, wherein said electrodes are shaped to have a topological order of connectivity equal to two.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |