US3914481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hot dip metallizing of metallic articles
Assignee: Individual
•
Filing: 1973-03-01
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Granted: 1975-10-21
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Expires: 1993-03-01
Abstract
Abstract The improved hot dip metallizing process of this invention comprises passing the article to be metallized, such as a ferrous article, through a bath of a molten heavy metal, such as lead, and conducting the article therefrom through a layer of molten coating metal, such as zinc, confined in a stack-like structure of a cross-sectional area being a small fraction of the surface area of the heavy metal bath. The coated article is preferably quenched or hot blasted and quenched immediately after leaving the stack. The top dross of the confined layer of coating metal can be automatically removed by overflow and is conducted into the coating metal melting oven where the metal oxides contained therein are reduced to the coating metal.
Inventors
- 👤 Theodore Bostroem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:32
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/14; C23C2/16; C23C2/18; C23C2/20; C23C2/003; C23C2/0034; C23C2/00342; C23C2/00344; C23C2/0038; C23C2/004; C23C2/02; C23C2/022; C23C2/0222; C23C2/04; C23C2/06; C23C2/325; C23C2/50; C23C2/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
IN A PROCESS OF HOT DIP METALLIZING FERROUS METAL ARTICLES BY IMMERSING SAID ARTICLES INTO A MOLTEN COATING METAL BATH, SAID COATING METAL BEING SELECTED FROM THE GROUP CONSISTING OF ZINC, ALUMINUM, CADMIUM, TIN AND TIN-LEAD ALLOY, THE IMPROVEMENT WHICH CONSISTING ESSENTIALLY OF A. PASSING THE ARTICLE TO BE METALLIZED THROUGH A BATH OF MOLTEN LEAD, B. CONDUCTING THE ARTICLE FROM SAID MOLTEN LEAD BATH THROUGH A. CONFINED SPACE CONTAINING A LAYER OF THE MOLTEN COATING METAL, THE SURFACE AREA OF SAID CONFINED SPACE BEING SMALL FRACTION OF THE SURFACE AREA OF THE LEAD BATH, C. CONTINUALLY SUPPLYING THE MOLTEN COATING METAL TO SAID CONFINED SPACE SO AS TO MAINTAIN SUBSTANTIALLY CONSTANT THE LEVEL OF THE MOLTEN COATING METAL IN SAID CONFINED SPACE, AND D. CONTINUALLY REMOVING THE TOP DROSS FORMED ON TOP OF THE MOLTEN COATING METAL FROM ITS SURFACE BY OVERFLOWING THE MOLTEN COATING METAL IN SAID CONFINED SPACE.
Claim 2
Dependent Claim
151 words
IN A PROCESS OF HOT DIP METALLIZING FERROUS METAL ARTICLES BY IMMERSING SAID ARTICLES INTO A MOLTEN COATING METAL BATH, SAID COATING METAL BEING SELECTED FROM THE GROUP CONSISTING OF ZINC, ALUMINUM, CADMIUM, TIN AND TIN-LEAD ALLOY, THE IMPROVEMENT WHICH CONSISTING ESSENTIALLY OF A. PASSING THE ARTICLE TO BE METALLIZED THROUGH A BATH OF MOLTEN LEAD, B. CONDUCTING THE ARTICLE FROM SAID MOLTEN LEAD BATH THROUGH A. CONFINED SPACE CONTAINING A LAYER OF THE MOLTEN COATING METAL, THE SURFACE AREA OF SAID CONFINED SPACE BEING SMALL FRACTION OF THE SURFACE AREA OF THE LEAD BATH, C. CONTINUALLY SUPPLYING THE MOLTEN COATING METAL TO SAID CONFINED SPACE SO AS TO MAINTAIN SUBSTANTIALLY CONSTANT THE LEVEL OF THE MOLTEN COATING METAL IN SAID CONFINED SPACE, AND D. CONTINUALLY REMOVING THE TOP DROSS FORMED ON TOP OF THE MOLTEN COATING METAL FROM ITS SURFACE BY OVERFLOWING THE MOLTEN COATING METAL IN SAID CONFINED SPACE.
Claim 3
Dependent Claim
54 words
The process of claim 1, in which e. the overflow with the top-dross is conducted into the supply means for the molten coating metal, and f. causing metal oxide present in the dross to be reduced to the coating metal by contact with a reducing agent floating on the molten coating metal supply means.
Claim 4
Dependent Claim
12 words
The process of claim 1, in which the coating metal is zinc.
Claim 5
Dependent Claim
46 words
The process of claim 1, further comprising the step of continuously, automatically detecting the height of said molten coating metal in said confined space and generating signals representative thereof and wherein said molten coating metal is supplied to said confined space in response to said signals.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |