US3976031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge coating apparatus
Assignee: Taiheiyo Cement Corp
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Filing: 1975-07-07
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Granted: 1976-08-24
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Expires: 1995-07-07
Abstract
Abstract A face-silent discharge electrode which includes plural parallel electrode bars separated from each other at a distance and arranged in a face is disposed to confront a substrate. A powder coating material is supplied in the space between said electrode and said substrate. An AC voltage is impressed on the electrode bars adjacent each other to generate a silent electric discharge over the entire surface of said face-silent discharge electrode. Concurrently, a DC voltage is impressed between the electrode bars and the substrate so that the powder coating material may adhere to a surface of the substrate to form a layer of uniform thickness.
Inventors
- 👤 Tsutomu Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:03
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/08; B05B5/087; B05B5/088; B05B14/00; B05B14/40; B05B14/42; B05B14/48; B05B5/081; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
84 words
An electric discharge coating apparatus for powder coating a substrate comprising a face-silent discharge electrode disposed to be separated from and to confront said substrate, means for introducing a powder coating material into a space between said face-silent discharge electrode and said substrate, power supply means coupled to said face-silent discharge electrode for impressing an AC voltage to cause a silent discharge on a surface of said face-silent discharge electrode, and means for impressing a voltage between said substrate and said face-silent discharge electrode.
Claim 2
Dependent Claim
84 words
An electric discharge coating apparatus for powder coating a substrate comprising a face-silent discharge electrode disposed to be separated from and to confront said substrate, means for introducing a powder coating material into a space between said face-silent discharge electrode and said substrate, power supply means coupled to said face-silent discharge electrode for impressing an AC voltage to cause a silent discharge on a surface of said face-silent discharge electrode, and means for impressing a voltage between said substrate and said face-silent discharge electrode.
Claim 3
Dependent Claim
21 words
The coating apparatus as defined in claim 1, wherein said face-silent discharge electrode surrounds the surface of said substrate being coated.
Claim 4
Dependent Claim
32 words
An electric discharge coating apparatus as defined in claim 1, wherein said face-silent discharge electrode is disposed to provide a uniform field strength everywhere on the surface of said substrate being coated.
Claim 5
Dependent Claim
28 words
An electric discharge coating apparatus as defined in claim 1, wherein said face-silent discharge electrode is composed of a plurality of parallel electrode bars spaced at equal distances.
Claim 6
Dependent Claim
53 words
An electric discharge coating apparatus as defined in claim 1, wherein said face-silent discharge electrode is composed of a plurality of parallel electrode bars spaced at equal distances and a face electrode, said face electrode being disposed at a distance from and parallel to the face including said plurality of parallel electrode bars.
Claim 7
Dependent Claim
31 words
An electric discharge coating apparatus as claimed in claim 4, wherein said power supply means for impressing an AC voltage is an AC power source coupled between two adjacent electrode bars.
Claim 8
Dependent Claim
43 words
An electric discharge coating apparatus as defined in claim 4, wherein said power supply means for impressing an AC voltage is means for coupling in common every third electrode bar and coupling a three-phase alternating power source to three groups of electrode bars.
Claim 9
Dependent Claim
54 words
An electric discharge coating apparatus as defined in claim 5, wherein said power supply means for impressing an AC voltage is an AC power source which is coupled between said plurality of parallel electrode bars and said face electrode, said face electrode being disposed parallel to the face including said plurality of electrode bars.
Claim 10
Dependent Claim
42 words
An electric discharge coating apparatus as defined in claim 1, wherein said means for impressing a voltage between said substrate and said face-silent discharge electrode is a high voltage DC power source which is connected between every electrode bar and said substrate.
Claim 11
Dependent Claim
39 words
An electric discharge coating apparatus as claimed in claim 1, and further including a duct for feeding powder on one edge of said discharge electrode and an opening for recovering dust positioned on another edge of said discharge electrode.
Claim 12
Dependent Claim
19 words
An electric discharge coating apparatus as defined in claim 5, wherein said face electrode is a pecticulately perforated plate.
Claim 13
Dependent Claim
30 words
An electric discharge coating apparatus as defined in claim 1, wherein said face-silent discharge electrode defines the inner surface of a guard ring for use with a rectangular plate-shaped substrate.
Claim 14
Dependent Claim
28 words
An electric discharge coating apparatus as defined in claim 1, wherein said substrate is pipe-shaped and said face-silent discharge electrode is disposed in concentric relation to said substrate.
Claim 15
Dependent Claim
32 words
An electric discharge coating apparatus as defined in claim 13, wherein said substrate is pipe-shaped and said face-silent discharge electrode is a tubular duct positioned to at least partially surround said substrate.
Claim 16
Dependent Claim
42 words
An electric discharge coating apparatus as defined in claim 1, wherein said face-silent discharge electrode is an inner surface of a pipe having a rectangular section and said substrate has an outer surface to be coated and is disposed in said pipe.
Claim 17
Dependent Claim
32 words
An electric discharge coating apparatus as defined in claim 1, and further including means for controlling the voltage applied to said face-silent discharge electrode to provide a coating of a predetermined property.
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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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |