Patent US4793480A successfully refreshed from Google Patents.
Patent US3742516A successfully refreshed from Google Patents.
US3742516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-ionic printing apparatus
Assignee: International Business Machines Corp
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Filing: 1972-03-16
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Granted: 1973-06-26
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Expires: 1992-03-16
Abstract
Abstract An improved printing head for forming electrostatic images on a dielectric surface by controlling the relative ion concentration in a gas stream moving through a slot and directed upon said dielectric surface. Application of an electric field across selected pairs of an array of spaced electrodes in the slot enables the stream to vary in ion concentration so as to cause the formation of a desired linear charge configuration on the dielectric. Selective application of low voltage electric fields to selected arrays of the electrodes causes formation of desired image charge configurations on the dielectric surface.
Inventors
- 👤 L Cavanaugh
- 👤 Curry R Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:18
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/323
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
An electro-ionic printing apparatus comprising, in combination, a source of gas-carried ions comprising a pressurized gas source and means for generating a high concentration of ions therein, an elongate rectangular slot connected to said source, said slot having a substantial depth in the direction of ion flow therethrough, a plurality of electrodes associated with said slot, said electrodes being arranged in pairs on opposite sides of said slot and spaced at intervals along said slot, said electrodes extending for substantially the depth of said slot, and means for selectively energizing one or more pairs of opposing electrodes with a voltage substantially less than the breakdown voltage of said pressurized gas.
Claim 2
Dependent Claim
110 words
An electro-ionic printing apparatus comprising, in combination, a source of gas-carried ions comprising a pressurized gas source and means for generating a high concentration of ions therein, an elongate rectangular slot connected to said source, said slot having a substantial depth in the direction of ion flow therethrough, a plurality of electrodes associated with said slot, said electrodes being arranged in pairs on opposite sides of said slot and spaced at intervals along said slot, said electrodes extending for substantially the depth of said slot, and means for selectively energizing one or more pairs of opposing electrodes with a voltage substantially less than the breakdown voltage of said pressurized gas.
Claim 3
Dependent Claim
37 words
An electro-ionic printing apparatus as claimed in claim 1, in which said electrodes comprise a plurality of electrically conductive plates separated by plates of insulation, and having interior edges opposing the opposite electrode edge in said slot.
Claim 4
Dependent Claim
52 words
An electro-ionic printing apparatus as claimed in claim 1, in which said slot is formed by a first and a second set of electrodes extending the depth of the slot, the respective electrodes in said sets being located opposite each other within said slot, and electrical insulating spacing plates separating said electrodes.
Claim 5
Dependent Claim
29 words
An electro-ionic printing apparatus as claimed in claim 3, in which all of the electrodes on one side of said slot are commonly connected to a bias voltage supply.
Claim 6
Dependent Claim
31 words
An electro-ionic printing apparatus as claimed in claim 3 in which the electrodes located on one side of said slot are selectively energized to affect the ion flow from said slot.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |