US3830997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and device for the thermal working and processing of high-melting-point materials
Assignee: US Philips Corp
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Filing: 1972-09-14
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Granted: 1974-08-20
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Expires: 1992-09-14
Abstract
Abstract A method and device for the thermal working and processing of high-melting-point materials, in which an electric arc is maintained in a gas stream between a primary electrode and an annular secondary electrode, and the arc plasma is constricted first by a flow aperture between the two electrodes and then by an outflow aperture of the secondary electrode, and the material is supplied to the arc plasma upstream of the flow aperture.
Inventors
- 👤 W Essers
- 👤 G Jelmorini
- 👤 G Tichelaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:09
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; B05B7/224; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/42; H05H1/3421; H05H1/3452
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
Apparatus for plasma arc welding operable with a source of plasma gas, an elEctric power source, and a supply of material to be heated, and comprising: a housing defining therein a chamber having a top part and axially spaced therefrom an open downstream end, the chamber including first duct means for introducing said plasma gas from the source into said chamber, a primary electrode having a tip end within said chamber and axially spaced inward from said downstream end, a complementary annular electrode at said downstream end, this annular electrode including an outflow aperture therethrough, a diaphragm with a flow aperture therethrough positioned axially intermediate said two electrodes, means for connecting said electrodes to said electric power source, second duct means through which said material to be heated is moved into said chamber, this second duct means having a terminal part in said chamber up stream of said diaphragm.
Claim 2
Dependent Claim
149 words
Apparatus for plasma arc welding operable with a source of plasma gas, an elEctric power source, and a supply of material to be heated, and comprising: a housing defining therein a chamber having a top part and axially spaced therefrom an open downstream end, the chamber including first duct means for introducing said plasma gas from the source into said chamber, a primary electrode having a tip end within said chamber and axially spaced inward from said downstream end, a complementary annular electrode at said downstream end, this annular electrode including an outflow aperture therethrough, a diaphragm with a flow aperture therethrough positioned axially intermediate said two electrodes, means for connecting said electrodes to said electric power source, second duct means through which said material to be heated is moved into said chamber, this second duct means having a terminal part in said chamber up stream of said diaphragm.
Claim 3
Dependent Claim
33 words
Apparatus according to claim 1, wherein said diaphragm aperture and said electrode aperture are generally coaxial and said primary electrode comprises a rod whose tip end is positioned eccentrically relative to said axis.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 1, wherein said second duct means comprises a tube generally coaxial with said diaphragm aperture and the complementary electrode aperture axes.
Claim 5
Dependent Claim
16 words
Apparatus according to claim 3, wherein said second duct means tube also comprises said primary electrode.
Claim 6
Dependent Claim
26 words
Apparatus according to claim 4, wherein said second duct means tube defines a bore surface, the apparatus further comprises an electrically insulating lining on said surface.
Claim 7
Independent Claim
108 words
A method of plasma arc welding for thermally working and processing high melting point material, comprising the steps of establishing in a chamber a stream of plasma gas flowing past a primary electrode and past and through the aperture of a complementary annular electrode axially spaced from said primary electrode, establishing and maintaing a plasma arc in said stream between said electrodes, constricting said arc with at least one aperture through which said stream flows between said electrodes, further constricting said arc by an aperture of said complementary electrode through which said stream flows, feeding said material into said arc upstream of said flow aperture between said electrodes.
Claim 8
Independent Claim
108 words
A method of plasma arc welding for thermally working and processing high melting point material, comprising the steps of establishing in a chamber a stream of plasma gas flowing past a primary electrode and past and through the aperture of a complementary annular electrode axially spaced from said primary electrode, establishing and maintaing a plasma arc in said stream between said electrodes, constricting said arc with at least one aperture through which said stream flows between said electrodes, further constricting said arc by an aperture of said complementary electrode through which said stream flows, feeding said material into said arc upstream of said flow aperture between said electrodes.
References Cited (Backward Citations)
US3097292A
Cited
US3280295A
Cited
US3297899A
Cited
US3575568A
Cited
US3612807A
Cited
US3569661A
Cited
US3632952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |