Patent US4133987A successfully refreshed from Google Patents.
US4133987A
Expired / Lapsed
US
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Electrode assembly for plasma arc torches
Assignee: Institute Elektrosvarki Im EO
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Filing: 1977-12-07
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Granted: 1979-01-09
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Expires: 1997-12-07
Abstract
Abstract In a plasma-arc torch for melting metals the electrode assembly comprises an electrode holder made of copper alloys and having a butt portion which rigidly secures a tungsten electrode by means of diffusion welding. The invention provides for a welded joint between the electrode and the electrode holder, a nonconsumable current-conducting interlayer made of titanium, copper and tungsten being placed therebetween.
Inventors
- 👤 Viktor I. Lakomsky
- 👤 Georgy M. Grigorenko
- 👤 Gennady F. Torkhov
- 👤 Gary A. Melnik
- 👤 Vitaly S. Nesmikh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:19
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; B; B23; B23K; B23K35/00; B23K35/001; B23K35/005; B23K35/02; B23K35/0205; H05H1/3436; H05H1/3442
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
An electrode assembly for plasma-arc torches, comprising an electrode holder made of copper or copper alloys and a tungsten electrode rigidly secured to a butt portion thereof, the tungsten electrode and the electrode holder being connected to each other using a current-conducting interlayer made of titanium, copper and tungsten.
Claim 2
Dependent Claim
49 words
An electrode assembly for plasma-arc torches, comprising an electrode holder made of copper or copper alloys and a tungsten electrode rigidly secured to a butt portion thereof, the tungsten electrode and the electrode holder being connected to each other using a current-conducting interlayer made of titanium, copper and tungsten.
Claim 3
Dependent Claim
19 words
An electrode assembly according to claim 1, wherein the length of the electrode (2) is less than its diameter.
Claim 4
Dependent Claim
32 words
An electrode assembly according to claim 1, wherein the nonconsumable current-conducting interlayer is formed by means of diffusion welding, a titanium foil being placed between the tungsten electrode and the electrode holder.
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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |