US3922516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing protective coatings on carbon electrodes
Assignee: METALURGITCHEN Z LENIN 219 76
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Filing: 1973-05-02
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Granted: 1975-11-25
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Expires: 1993-05-02
Abstract
Abstract Carbon electrodes, e.g. for electric-arc furnaces, are provided with protective coatings by initially metallizing the surface of an electrode by deposition of a metallic layer thereon, applying a metallic paste, and treating the coated surface with an electric arc while stabilizing the arc with a magnetic field such that the axis of the magnetic field substantially coincides with the axis of the arc-generating electrode.
Inventors
- 👤 Alexander Jordanov Valtchev
- 👤 Emil Pantaleev Minov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:44
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B23; B23K; B23K9/00; B23K9/06; B23K9/073; B23K9/0737; C04B35/00; C04B35/515; C04B35/52; C04B41/45; C04B41/4505; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; H05B7/085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A METHOD OF PRODUCING A COATED CARBON ARTICLE, COMPRISING THE STEPS OF APPLYING ALUMINUM COATING MATERIAL TO A SURFACE OF A CARBON ARTICLE; SWEEPING A CONTINUOUS ELECTRIC ARC ACROSS THE SURFACE COATED WITH SAID MATERIAL WITH AN ARC CURRENT OF 1000 TO 2500 AMPERES AND A SPACING BETWEEN INCREMENTS OF PASSAGE OF THE ARC OVER SAID SURFACE OF ABOUT 13 MM; AND APPLYING A MAGNETIC FIELD TO SAID ARC WHILE SWEEPING SAME ACROSS SAID SURFACE TO STABILIZE THE ARC, SAID MAGNETIC FIELD HAVING AN AXIS SUBSTANTIALLY PERPENDICULAR TO SAID SURFACE AND PARALLEL TO SAID ARC AND BEING GENERATED BY PASSING CURRENT THROUGH A COIL SUBSTANTIALLY COAXIAL WITH SAID ARC.
Claim 2
Independent Claim
109 words
A METHOD OF PRODUCING A COATED CARBON ARTICLE, COMPRISING THE STEPS OF APPLYING ALUMINUM COATING MATERIAL TO A SURFACE OF A CARBON ARTICLE; SWEEPING A CONTINUOUS ELECTRIC ARC ACROSS THE SURFACE COATED WITH SAID MATERIAL WITH AN ARC CURRENT OF 1000 TO 2500 AMPERES AND A SPACING BETWEEN INCREMENTS OF PASSAGE OF THE ARC OVER SAID SURFACE OF ABOUT 13 MM; AND APPLYING A MAGNETIC FIELD TO SAID ARC WHILE SWEEPING SAME ACROSS SAID SURFACE TO STABILIZE THE ARC, SAID MAGNETIC FIELD HAVING AN AXIS SUBSTANTIALLY PERPENDICULAR TO SAID SURFACE AND PARALLEL TO SAID ARC AND BEING GENERATED BY PASSING CURRENT THROUGH A COIL SUBSTANTIALLY COAXIAL WITH SAID ARC.
Claim 3
Dependent Claim
31 words
The method defined in claim 1 wherein said magnetic field is produced by passing an electric current through a coil substantially coaxial with said arc and independent of the arc-forming current.
Claim 4
Dependent Claim
13 words
A coated carbon article as made by the method defined in claim 1.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |