Patent US4289949A successfully refreshed from Google Patents.
US4289949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma burners
Assignee: SINTEF AS
•
Filing: 1979-06-06
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Granted: 1981-09-15
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Expires: 1999-06-06
Abstract
Abstract Plasma burner provided with an electrode holder for the support of a centrally arranged electrode and an outer electrode, a device for applying an electrical voltage for producing an electric arc between the electrodes and a device for the supply of gas to the electric arc area of the electrodes. The electrodes constitute a continuously consumable electrode system in which the outer electrode has the shape of a pipe while the other electrode is pipe- or rod-shaped and coaxially arranged within the outer electrode so as to define therebetween a passage of annular cross-section. The electrode holder is designed to conduct gas through the passage forwards to a front, free end of the electrodes where the electric discharge occurs from the end of the inner electrode.
Inventors
- 👤 Ola S. Raaness
- 👤 Jon A. Bakken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:30
CPC Classifications
B; B23; B23K; B23K10/00; H; H05; H05B; H05B7/00; H05B7/02; H05B7/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
Plasma burner comprising a centrally arranged electrode, an outer electrode and an electrode holder for the support of said electrodes, means for applying an electrical voltage for producing an electric arc between the electrodes and means for the supply of gas to the electric arc area of said electrodes, the electrodes being made of a non-melting and subliming material to constitute a continuously consumable system in which said outer electrode has the shape of a pipe and said centrally arranged electrode has a shape selected from that of a row and a pipe and is coaxially arranged within said outer electrode so as to define therebetween an elongate passage of annular cross-section, and said electrode holder being designed to conduct gas through said passage forwards to a front, free end of the electrodes where the electric discharge occurs from the end of said inner electrode.
Claim 2
Dependent Claim
145 words
Plasma burner comprising a centrally arranged electrode, an outer electrode and an electrode holder for the support of said electrodes, means for applying an electrical voltage for producing an electric arc between the electrodes and means for the supply of gas to the electric arc area of said electrodes, the electrodes being made of a non-melting and subliming material to constitute a continuously consumable system in which said outer electrode has the shape of a pipe and said centrally arranged electrode has a shape selected from that of a row and a pipe and is coaxially arranged within said outer electrode so as to define therebetween an elongate passage of annular cross-section, and said electrode holder being designed to conduct gas through said passage forwards to a front, free end of the electrodes where the electric discharge occurs from the end of said inner electrode.
Claim 3
Dependent Claim
14 words
The burner according to claim 1, wherein the electrodes are made of silicon carbide.
Claim 4
Dependent Claim
13 words
The burner according to claim 1, wherein the electrodes are made of graphite.
Claim 5
Dependent Claim
50 words
The burner according to claim 1, wherein the electrode holder comprises a front and rear, contact-forming holder member for the support of the outer and inner electrodes respectively, there being arranged between the holder members an electrically insulating plate and the holder members being fastened to an insulating support plate.
Claim 6
Dependent Claim
52 words
The burner according to claim 4, wherein each of the holder members is horizontally divided into two halves, the associated halves being provided with opposite part-cylindrical grooves having a radius which corresponds to the outer half diameter of the relevant electrode, and are secured to each other by means of fastening bolts.
Claim 7
Dependent Claim
52 words
The burner according to claim 4, wherein the holder member of the inner electrode is provided with an annular space situated around the inner electrode which via an annular passage in the insulating plate is connected to the passage between the electrodes and which can be connected to an outer gas source.
Claim 8
Dependent Claim
38 words
The burner according to claim 1, wherein the inner electrode is adapted to be able to be axially displaced relative to the outer electrode so as to regulate the axial distance between the free ends of the electrodes.
Claim 9
Dependent Claim
44 words
The burner according to claim 1, wherein the electrodes are centered relative to each other by means of a plurality of electrically insulating spacers which at a distance from the free end of the electrodes are distributed along the periphery of the inner electrode.
References Cited (Backward Citations)
GB1018631A
Cited
US3270178A
Cited
US3626147A
Cited
US3407281A
Cited
US3615924A
Cited
US3748434A
Cited
US4147916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |