US3825718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasmatron
Assignee: Individual
•
Filing: 1971-12-08
•
Granted: 1974-07-23
•
Expires: 1991-12-08
Abstract
Abstract A consumable cathode plasma arc torch for working metals with a water-stabilized plasma arc in which a tubular nozzle is mounted in co-axial relationship to the cathode with the lower lateral surface thereof in coplanar relationship with an upper lateral surface of one of two tandenly mounted arc forming nozzles. This relationship increases the reliability and efficiency of the plasma arc torch by decreasing the possibility of cooling liquid getting into the arc-forming nozzles and by decreasing the distance between the lower end of the cathode and the inner arcforming nozzle.
Inventors
- 👤 I Navdarashvili
- 👤 M Devdariani
- 👤 O Mosiashvili
- 👤 R Suladze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:59
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; B; B23; B23K; B23K10/00; H05H1/3452; H05H1/3468
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A plasmatron for working metals with a water-stabilized plasma arc, comprising a consumable cathode; two arc-forming nozzles, a first one of said nozzles axially inside the plasmatron being positioned in front of the consumable end of said cathode and a second of said nozzles being spaced downstream of the first, adjacent the axial end of the plasmatron; means for delivering water intermediate said nozzles to stabilize the plasma arc; and a tubular nozzle surrounding said consumable end and having a laterally extending channel co-axial with said consumable end for tangential delivery into it of a cooling liquid, said tubular nozzle having a lower end surface thereOf being in at least axially coplanar relationship with an upper lateral surface plane of the first one of said arc-forming nozzles so as to form an annular passageway therebetween for egress of said plasma arc-stabilizing water.
Claim 2
Dependent Claim
142 words
A plasmatron for working metals with a water-stabilized plasma arc, comprising a consumable cathode; two arc-forming nozzles, a first one of said nozzles axially inside the plasmatron being positioned in front of the consumable end of said cathode and a second of said nozzles being spaced downstream of the first, adjacent the axial end of the plasmatron; means for delivering water intermediate said nozzles to stabilize the plasma arc; and a tubular nozzle surrounding said consumable end and having a laterally extending channel co-axial with said consumable end for tangential delivery into it of a cooling liquid, said tubular nozzle having a lower end surface thereOf being in at least axially coplanar relationship with an upper lateral surface plane of the first one of said arc-forming nozzles so as to form an annular passageway therebetween for egress of said plasma arc-stabilizing water.
Claim 3
Dependent Claim
31 words
A plasmatron according to claim 1 wherein said lower end surface of the tubular nozzle terminates so as to be coplanar with the upper lateral surface of said first arc-forming nozzle.
Claim 4
Dependent Claim
21 words
A plasmatron according to claim 1 wherein said lower end surface of the tubular nozzle extends into said first arc-forming nozzle.
References Cited (Backward Citations)
US3344256A
Cited
US3097292A
Cited
US3575568A
Cited
US3567898A
Cited
US3553422A
Cited
US3641308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |