Patent US4687438A successfully refreshed from Google Patents.
US4687438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft melting furnace for melting metals
Assignee: W STRIKFELDT & KOCH A CORP OF GERMANY GmbH
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Filing: 1986-04-18
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Granted: 1987-08-18
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Expires: 2006-04-18
Abstract
Abstract A shaft melting furnace for melting metals is proposed with an interior receiving the molten bath, a charging shaft for supplying the melting stock and a burner supplying heat to the latter. The charging shaft is funnel-shaped and passes into a melting zone of constant cross-section leading to a melting bridge.
Inventors
- 👤 Gunther Schmidt
- 👤 Joseph W. M. Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:42
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/02; F27B1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A shaft melting furnace for melting metals with a heat-maintaining area receiving the molten bath comprising a charging shaft for supplying the melting stock. and a burner means providing heat to the melting stock, the charging shaft having a funnel-shaped construction and being connected to a melting zone of constant cross-section leading to a melting ramp included slightly with respect to the horizontal, with a transition zone therebetween formed by a lower end of the melting zone, the burner means being arranged in the vicinity of said zone and its action being fully directed onto the transmission, with a cleaning door in the vicinity of the melting ramp provided for removing residue, wherein the melting zone with melting ramp and heat-maintaining area are superposed.
Claim 2
Dependent Claim
124 words
A shaft melting furnace for melting metals with a heat-maintaining area receiving the molten bath comprising a charging shaft for supplying the melting stock. and a burner means providing heat to the melting stock, the charging shaft having a funnel-shaped construction and being connected to a melting zone of constant cross-section leading to a melting ramp included slightly with respect to the horizontal, with a transition zone therebetween formed by a lower end of the melting zone, the burner means being arranged in the vicinity of said zone and its action being fully directed onto the transmission, with a cleaning door in the vicinity of the melting ramp provided for removing residue, wherein the melting zone with melting ramp and heat-maintaining area are superposed.
Claim 3
Dependent Claim
16 words
The shaft furnace according to claim 1, wherein the melting zone is inclined to the vertical.
Claim 4
Dependent Claim
23 words
The shaft furnace according to claim 1, further comprising means for determining the waste gas temperature at a point above the charging shaft.
Claim 5
Dependent Claim
24 words
The shaft furnace according to claim 3, further comprising an automatic charging means which is controlled as a function of the waste gas temperature.
Claim 6
Dependent Claim
140 words
A shaft melting furnace for melting metals with a heat-maintaining area receiving the molten bath comprising a charging shaft for supplying the melting stock and a burner means providing heat to the melting stock, the charging shaft having a funnel-shaped construction and being connected to a melting zone of constant cross-section leading to a melting ramp inclined slightly with respect to the horizontal, with a transition zone therebetween formed by a lower end of the melting zone, the burner means being arranged in the vicinity of said zone and its action being fully directed onto the transmission, with a cleaning door in the vicinity of the melting ramp provided for removing residue, wherein the melting zone with melting ramp and heat-maintaining area are arranged side-by-side being separated by a wall with an opening for the passage of the molten metal.
Claim 7
Dependent Claim
140 words
A shaft melting furnace for melting metals with a heat-maintaining area receiving the molten bath comprising a charging shaft for supplying the melting stock and a burner means providing heat to the melting stock, the charging shaft having a funnel-shaped construction and being connected to a melting zone of constant cross-section leading to a melting ramp inclined slightly with respect to the horizontal, with a transition zone therebetween formed by a lower end of the melting zone, the burner means being arranged in the vicinity of said zone and its action being fully directed onto the transmission, with a cleaning door in the vicinity of the melting ramp provided for removing residue, wherein the melting zone with melting ramp and heat-maintaining area are arranged side-by-side being separated by a wall with an opening for the passage of the molten metal.
Claim 8
Dependent Claim
23 words
The shaft furnace according to claim 5, further comprising means for determining the waste gas temperature at a point above the charging shaft.
Claim 9
Dependent Claim
24 words
The shaft furnace according to claim 6, further comprising an automatic charging means which is controlled as a function of the waste gas aperture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |