US3628079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc plasma generators
Assignee: British Railways Board
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Filing: 1970-02-03
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Granted: 1971-12-14
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Expires: 1990-02-03
Abstract
Abstract A plasma generator comprises a torch in which a spacer made of a refractory material and having a central opening in which the cathode is fitted and a concentric ring of peripheral openings which serve to feed the plasma gas into the arc chamber of the torch in uniformly distributed fashion is provided in the interior of the anode unit. Suitably the spacer is of disc-shape with a concentric ring of equally spaced openings extending axially through it.
Inventors
- 👤 David John Miller Dobbs
- 👤 Derek Linder
- 👤 Leslie John Giles
- 👤 Joseph Kenneth Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:36
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A plasma generator comprising a torch including a cathode and an anode with an arc chamber, wherein a spacer made of a refractory material and having a central opening in which the cathode is fitted and a concentric ring of equally spaced substantially axially extending openings spaced from the said cathode and anode which serve to feed the plasma gas into the arc chamber in uniformly distributed fashion is provided in the interior of the anode and extends into the arc chamber.
Claim 2
Dependent Claim
82 words
A plasma generator comprising a torch including a cathode and an anode with an arc chamber, wherein a spacer made of a refractory material and having a central opening in which the cathode is fitted and a concentric ring of equally spaced substantially axially extending openings spaced from the said cathode and anode which serve to feed the plasma gas into the arc chamber in uniformly distributed fashion is provided in the interior of the anode and extends into the arc chamber.
Claim 3
Dependent Claim
35 words
A generator according to claim 1, wherein the spacer has a flange by which it rests on an annular shoulder in the anode and a hublike part by which it fits into the arc chamber.
Claim 4
Dependent Claim
34 words
A generator according to claim 1, wherein the ring of openings in the spacer is located substantially at the midwidth of the annular space between the cathode and the wall of the arc chamber.
References Cited (Backward Citations)
US2858412A
Cited
US3238349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |