US3729611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma generator
Assignee: CENTRUL DE SUDURA SI INCERCARI
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Filing: 1971-06-08
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Granted: 1973-04-24
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Expires: 1991-06-08
Abstract
Abstract A plasma generator with a hollow electrode connected to a venturi pump which draws a portion of the gas out of the arc chamber in a direction away from the workpiece to stabilize a molten-metal pool formed by the plasma generator. The withdrawn portion of the gas is recycled to the region around the plasma arc between the arc chamber and the workpiece.
Inventors
- 👤 A Vas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:24
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/40; H05H1/42; H05H1/3436
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
A plasma-arc generator comprising: a housing structure; a nozzle received in said housing structure and having a mouth adapted to be trained against a workpiece; a tubular electrode mounted in said housing structure and extending axially toward said nozzle while defining an arc chamber therewith for generating a plasma therein; means communicating with said arc chamber for introducing a plasmogen gas thereto for conversion into a plasma and projection through said nozzle as a plasma jet against said workpiece; an annular piece spacedly surrounding said nozzle at the mouth thereof to define an annular compartment opening inwardly toward said workpiece; and a venturi pump connected to said electrode and to said annular chamber for inducing a portion of the plasmogen gas to flow away from said mouth and said workpiece through said electrode in said arc chamber and thereafter returning said portion through said annular chamber, thereby reducinG the velocity of said jet.
Claim 2
Dependent Claim
153 words
A plasma-arc generator comprising: a housing structure; a nozzle received in said housing structure and having a mouth adapted to be trained against a workpiece; a tubular electrode mounted in said housing structure and extending axially toward said nozzle while defining an arc chamber therewith for generating a plasma therein; means communicating with said arc chamber for introducing a plasmogen gas thereto for conversion into a plasma and projection through said nozzle as a plasma jet against said workpiece; an annular piece spacedly surrounding said nozzle at the mouth thereof to define an annular compartment opening inwardly toward said workpiece; and a venturi pump connected to said electrode and to said annular chamber for inducing a portion of the plasmogen gas to flow away from said mouth and said workpiece through said electrode in said arc chamber and thereafter returning said portion through said annular chamber, thereby reducinG the velocity of said jet.
Claim 3
Dependent Claim
22 words
The plasma-arc generator defined in claim 1, further comprising means for introducing metal powder into said annular chamber for metallizing said workpiece.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |