US3585434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma jet generating apparatus
Assignee: Hitachi Ltd
•
Filing: 1969-01-21
•
Granted: 1971-06-15
•
Expires: 1989-01-21
Abstract
Abstract A plasma jet generating apparatus comprising a cathode formed of an annular electrode and an anode formed of a cylindrical electrode inserted at the central portion of said annular cathode wherein an arc is generated between the electrodes to heat a gas to a high temperature.
Inventors
- 👤 Yomei Kato
- 👤 Takashi Omori
- 👤 Shigeru Kajiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:15
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
A plasma jet generating apparatus comprising: A first cylindrical chamber wall; A second cylindrical chamber wall having the same inner diameter as said first cylindrical chamber wall and being concentric therewith; An annular cathode disposed between said first and said second cylindrical chamber walls so as to form a chamber therewith, the minimum inner diameter and the width along the axial direction of said annular cathode being smaller than the inner diameters and the widths of said first and said second cylindrical chamber walls, respectively, so that said annular cathode projects inwardly from the surfaces of said cylindrical chamber walls; Sealing means attached to one end of said first cylindrical chamber wall for sealing the end of said chamber; A cylindrically shaped anode coaxially disposed in said chamber and positioned to form an annular discharge gap between said annular cathode and said cylindrically shaped anode, the end of said cylindrically shaped anode being placed axially at the intermediate portion of said annular cathode, said cylindrically shaped anode being supported by said sealing means; and A working gas inlet being arranged in said sealing means for introducing gas to said discharge gap.
Claim 2
Dependent Claim
191 words
A plasma jet generating apparatus comprising: A first cylindrical chamber wall; A second cylindrical chamber wall having the same inner diameter as said first cylindrical chamber wall and being concentric therewith; An annular cathode disposed between said first and said second cylindrical chamber walls so as to form a chamber therewith, the minimum inner diameter and the width along the axial direction of said annular cathode being smaller than the inner diameters and the widths of said first and said second cylindrical chamber walls, respectively, so that said annular cathode projects inwardly from the surfaces of said cylindrical chamber walls; Sealing means attached to one end of said first cylindrical chamber wall for sealing the end of said chamber; A cylindrically shaped anode coaxially disposed in said chamber and positioned to form an annular discharge gap between said annular cathode and said cylindrically shaped anode, the end of said cylindrically shaped anode being placed axially at the intermediate portion of said annular cathode, said cylindrically shaped anode being supported by said sealing means; and A working gas inlet being arranged in said sealing means for introducing gas to said discharge gap.
Claim 3
Dependent Claim
50 words
A plasma jet generating apparatus as defined in claim 1, further comprising field generating means for generating a magnetic field in said chamber to rotate an arc formed in said annular discharge gap including first and second coil members arranged outside of said first and second cylindrical chamber walls, respectively.
Claim 4
Dependent Claim
55 words
A plasma jet generating apparatus as defined in claim 2, wherein said first cylindrical chamber wall and said first coil member form a first unit, and said second cylindrical chamber wall and said second coil member form a second unit, and further including means for detachably mounting said first and second units to each other.
Claim 5
Dependent Claim
49 words
A plasma jet generating apparatus as defined in claim 3, further including at least one feed gas inlet provided in said annular cathode on the side of said second cylindrical chamber wall to supply feed gas to said chamber in a direction transverse to the axis of said chamber.
Claim 6
Dependent Claim
16 words
A plasma jet generating apparatus as defined in claim 4, wherein said annular cathode is nozzle-shaped.
Claim 7
Dependent Claim
48 words
A plasma jet generating apparatus as defined in claim 4, wherein the end of said cylindrically shaped anode positioned within said annular cathode has an end surface which is transverse to the axis of said anode, and the surface of said cathode facing said anode is arcuately curved.
Claim 8
Dependent Claim
30 words
A plasma jet generating apparatus as defined in claim 4, wherein the surface of said cathode facing said anode is conically shaped and inclined toward said second cylindrical chamber wall.
References Cited (Backward Citations)
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US2862099A
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US3225245A
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US3182176A
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US3201560A
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |