US3770935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma jet generator
Assignee: RIKEN
•
Filing: 1971-12-21
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Granted: 1973-11-06
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Expires: 1991-12-21
Abstract
Abstract Disclosed is an improved plasma jet generator comprising at least two plasma jet torches and a guide attachment integrally connected to the torches with a view to fixing the anode foot of a non-transferred type plasma jet. This special structure permits the proper selection of the point of the anode foot of the plasma jet with respect to the cathode spot of the plasma jet, thus realizing a high voltage plasma jet. Also, the new structure prevents the local erosion to the parts of the electrodes on which the anode foot and the cathode spot stand by means of an inactive gas, thus allowing the main arc column to directly heat a high concentrated active gas.
Inventors
- 👤 H Tateno
- 👤 T Ichimiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:36
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A plasma jet generator comprising a plurality of plasma jet torches, a hollow guide attached to said torches, said hollow guide having an outlet and a plurality of inlets, said inlets being disposed to receive and direct the gas streams from respective torches to intersect at a given location within the guide to form a combined plasma jet exiting the guide through said outlet, said inlets and outlets being the only openings in said hollow guide, one of said torches including a cathode rod and at least two bushings which define a gas flow space, and said hollow guide being electrically insulated from at least one of said torches by a body of dielectric material.
Claim 2
Dependent Claim
115 words
A plasma jet generator comprising a plurality of plasma jet torches, a hollow guide attached to said torches, said hollow guide having an outlet and a plurality of inlets, said inlets being disposed to receive and direct the gas streams from respective torches to intersect at a given location within the guide to form a combined plasma jet exiting the guide through said outlet, said inlets and outlets being the only openings in said hollow guide, one of said torches including a cathode rod and at least two bushings which define a gas flow space, and said hollow guide being electrically insulated from at least one of said torches by a body of dielectric material.
Claim 3
Dependent Claim
26 words
A plasma jet generator according to claim 1 including two plasma jet torches disposed to produce gas streamS that are oriented generally perpendicular to each other.
Claim 4
Dependent Claim
34 words
A plasma jet generator according to claim 1 including three plasma jet torches disposed to produce gas streams, two of which gas streams are oriented generally symmetrical with respect to the third gas stream.
References Cited (Backward Citations)
US3373306A
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US3403211A
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US3536885A
Cited
US3476907A
Cited
US3588594A
Cited
US3541297A
Cited
US3601578A
Cited
US3644782A
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |