US3604980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drop-charging apparatus
Assignee: Eastman Kodak Co
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Filing: 1970-05-25
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Granted: 1971-09-14
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Expires: 1990-05-25
Abstract
Abstract In a noncontacting coating system in which drops of coating material are selectively charged to divert them from their normal trajectory and thereby permit a patterned coating layer to be applied to a workpiece, the drop charging element is formed as a support plate having a planar surface parallel to the initial path of the coating drops and provided with strips of conductive material connected to appropriate leads for selectively charging the drops as they pass the conductive strips. A shield bar is positioned adjacent the support plate and notches are formed in the bar opposite the conductive strips. The shield bar may be formed of a conductive material, or coated with a conductive material at least in the area of the notches, and a selectively variable potential applied thereto to adjust the trajectory of all drops simultaneously.
Inventors
- 👤 John A Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
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
173 words
In noncontacting coating apparatus including an orifice plate having a series of regularly formed orifices therethrough, means for supplying coating material under pressure to said orifices, and means positioned downstream of said orifice plate for establishing an electrostatic field through which a jet filament of coating material from said orifices passes, the improvement comprising: a. an elongated support plate positioned beneath said orifice plate in closely spaced relationship thereto, b. said support plate having at least one substantially planar surface extending in substantially parallel relationship to the path of said coating material from said orifices, c. spaced applications of electrically conductive material positioned on said substantially planar surface at points therealong corresponding to the positions of said orifices in said orifice plate, d. means for selectively energizing each of said applications, e. a shield bar extending coextensively with and in close proximity to said substantially planar surface, and f. means defining a series of open-sided notches in said shield bar, each positioned in opposition to one of said spaced applications of conductive material.
Claim 2
Dependent Claim
173 words
In noncontacting coating apparatus including an orifice plate having a series of regularly formed orifices therethrough, means for supplying coating material under pressure to said orifices, and means positioned downstream of said orifice plate for establishing an electrostatic field through which a jet filament of coating material from said orifices passes, the improvement comprising: a. an elongated support plate positioned beneath said orifice plate in closely spaced relationship thereto, b. said support plate having at least one substantially planar surface extending in substantially parallel relationship to the path of said coating material from said orifices, c. spaced applications of electrically conductive material positioned on said substantially planar surface at points therealong corresponding to the positions of said orifices in said orifice plate, d. means for selectively energizing each of said applications, e. a shield bar extending coextensively with and in close proximity to said substantially planar surface, and f. means defining a series of open-sided notches in said shield bar, each positioned in opposition to one of said spaced applications of conductive material.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 further comprising: a. a substantially continuous layer of electrically insulative material applied to said substantially planar surface to insulate said spaced applications from each other.
Claim 4
Dependent Claim
32 words
The apparatus of claim 1 wherein: a. said shield bar is provided with a coating of an electrically conductive material in at least that portion thereof in which said notches are formed.
Claim 5
Dependent Claim
26 words
The apparatus of claim 3 further comprising: a. means for applying an electric potential difference between said shield bar and said jet filament of coating material.
Claim 6
Dependent Claim
14 words
The apparatus of claim 4 further comprising: a. means for varying said potential difference.
References Cited (Backward Citations)
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |