US4084019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic coating grid and method
Assignee: Armco Inc
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Filing: 1976-02-05
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Granted: 1978-04-11
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Expires: 1996-02-05
Abstract
Abstract A power grid for a fluidized bed for electrostatically depositing a powdered plastic coating material from the bed onto an elongated metal substrate moving in a path of travel above the upper surface of the bed on a substantially horizontal pass line. The power grid includes two co-planar wire mesh elements positioned beneath the surface of the bed, the elements having opposed edges in parallel spaced relationship and defining a gap therebetween beneath the pass line. The edges are upturned to form a plurality of electrode segments, the tips of the electrode segments being substantially coincident with the upper surface of the bed when energized. In operation the electrode segments form a row of localized corona discharges to either side of the passing substrate to effect electrostatic deposition of a thin uniform film coating of the powdered material thereon.
Inventors
- 👤 Christy Christ
- 👤 Hart F. Graff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:59
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/02; B05C19/025; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A method for electrostatically depositing a uniform coating of thin film of powdered plastic on an elongated metal substrate, which comprising the steps: (a) providing fluidized bed means including a substantially closed container having a passageway for receiving an elongated metallic substrate; (b) conveying said elongated metal substrate through the passage way of said fluidized bed means in a path of travel above the upper surface of said bed on a substantially horizontal pass line; and (c) forming a row of localized corona discharges to either side of said passing substrate to effect electrostatic deposition of a thin uniform film coating of said powdered material thereon by a power grid comprising two co-planar wire mesh elements positioned beneath the surface of said bed, said elements having opposed edges in parallel spaced relationship and defining a gap therebetween beneath said pass line, said edges being upturned to form a plurality of electrode segments, the tips of said electrode segments being substantially coincident with the upper surface of said bed when energized.
Claim 2
Independent Claim
170 words
A method for electrostatically depositing a uniform coating of thin film of powdered plastic on an elongated metal substrate, which comprising the steps: (a) providing fluidized bed means including a substantially closed container having a passageway for receiving an elongated metallic substrate; (b) conveying said elongated metal substrate through the passage way of said fluidized bed means in a path of travel above the upper surface of said bed on a substantially horizontal pass line; and (c) forming a row of localized corona discharges to either side of said passing substrate to effect electrostatic deposition of a thin uniform film coating of said powdered material thereon by a power grid comprising two co-planar wire mesh elements positioned beneath the surface of said bed, said elements having opposed edges in parallel spaced relationship and defining a gap therebetween beneath said pass line, said edges being upturned to form a plurality of electrode segments, the tips of said electrode segments being substantially coincident with the upper surface of said bed when energized.
Claim 3
Dependent Claim
179 words
In an apparatus for electrostatically depositing a powdered plastic coating material on an elongated metal substrate, the combination comprising: (a) fluidized bed means including a substantially closed container having a passage way for receiving an elongated metal substrate moving in a path of travel above the upper surface of the bed; (b) means for conveying said elongated metal substrate through the passage way of said fluidized bed on a substantially horizontal pass line; and (c) a power grid for producing a cloud of electrostatically charged particles comprising two co-planar wire mesh elements positioned beneath the surface of the bed, the elements having opposed edges in parallel spaced relationship and defining a gap therebetween beneath said pass line, said edges being upturned to form a plurality of electrode segments, the tips of said electrode segments being substantially coincident with the upper surface of said bed when energized; whereby said electrode segments form a row of localized corona discharges to either side of said passing substrate to effect electrostatic deposition of a thin uniform film coating of said powdered material thereon.
Claim 4
Dependent Claim
179 words
In an apparatus for electrostatically depositing a powdered plastic coating material on an elongated metal substrate, the combination comprising: (a) fluidized bed means including a substantially closed container having a passage way for receiving an elongated metal substrate moving in a path of travel above the upper surface of the bed; (b) means for conveying said elongated metal substrate through the passage way of said fluidized bed on a substantially horizontal pass line; and (c) a power grid for producing a cloud of electrostatically charged particles comprising two co-planar wire mesh elements positioned beneath the surface of the bed, the elements having opposed edges in parallel spaced relationship and defining a gap therebetween beneath said pass line, said edges being upturned to form a plurality of electrode segments, the tips of said electrode segments being substantially coincident with the upper surface of said bed when energized; whereby said electrode segments form a row of localized corona discharges to either side of said passing substrate to effect electrostatic deposition of a thin uniform film coating of said powdered material thereon.
Claim 5
Dependent Claim
20 words
The power grid according to claim 2, wherein said wire mesh elements comprise one-half inch by one-half inch wire mesh.
Claim 6
Dependent Claim
22 words
The power grid according to claim 2, wherein said two wire mesh elements are connected to a common surface of high voltage.
Claim 7
Dependent Claim
36 words
The power grid according to claim 2, wherein said electrode segments of each said wire mesh element are cut so as to eliminate the longitudinal wire and provide a series of exposed, sharp, pointed wire ends.
Claim 8
Dependent Claim
31 words
The power grid according to claim 2, wherein said co-planar wire mesh elements are substantially horizontal and each said upturned electrode segments is substantially perpendicular to its respective wire mesh element.
References Cited (Backward Citations)
US2421787A
Cited
US2503224A
Cited
US2625590A
Cited
US2758535A
Cited
US2889805A
Cited
US3248253A
Cited
US3336903A
Cited
US3566833A
Cited
US3672927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |