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US3725951A
Expired / Lapsed
US
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Electro-ionic printing
Assignee: International Business Machines Corp
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Filing: 1971-06-16
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Granted: 1973-04-03
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Expires: 1991-06-16
Abstract
Abstract A method of forming electrostatic images on a dielectric surface by controlling the relative ion concentration in a gas stream moving through a channel and directed upon said dielectric surface. Application of an electric field across the channel 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 electric fields to an array of channels causes formation of desired image charge configurations on the dielectric surface.
Inventors
- 👤 Curry R Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/323
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A method of forming a latent electrostatic image on a dielectric surface comprising: generating a high concentration of ions in a pressurized gas in a chamber; forming a plurality of individual ion streams from the ionized pressurized gas chamber; selectively applying a transverse electric field to said streams to produce ionically modulated streams; and directing said modulated streams upon said dielectric surface to form said latent image, the potential across said field being substantially less than the breakdown potential of said gas.
Claim 2
Independent Claim
82 words
A method of forming a latent electrostatic image on a dielectric surface comprising: generating a high concentration of ions in a pressurized gas in a chamber; forming a plurality of individual ion streams from the ionized pressurized gas chamber; selectively applying a transverse electric field to said streams to produce ionically modulated streams; and directing said modulated streams upon said dielectric surface to form said latent image, the potential across said field being substantially less than the breakdown potential of said gas.
Claim 3
Dependent Claim
18 words
The method of claim 1 in which said individual ion streams are configured with a desired cross section.
Claim 4
Dependent Claim
22 words
The method of claim 1 in which said electric fields are varied so to provide variations in the intensity of said images.
Claim 5
Dependent Claim
17 words
The method of claim 1 in which said dielectric surface is moved during formation of the image.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |