US3777044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma-arc furnace
Assignee: Individual
•
Filing: 1971-10-01
•
Granted: 1973-12-04
•
Expires: 1991-10-01
Abstract
Abstract A plasma-arc furnace for remelting of sheet-waste material of high reactivity metals and their alloys has a furnace chamber containing a mould, plasmatrons mounted on a roof of the chamber, and a charging device for feeding sheet-waste material into a melting zone. The charging device has a hopper arranged to contain the sheet-waste material, a water-cooled base plate, guide troughs along which the sheet-waste material is fed, and controlling means to control the feed of the sheet-waste into the melting zone. The furnace expediently employs a stripping and conveying gear to deliver remelted sheet-waste material in any desired form such as a bar or a slab.
Inventors
- 👤 A Voropaev
- 👤 V Pilipchuk
- 👤 S Shekhter
- 👤 A Reznitsky
- 👤 L Tsipura
- 👤 O Zabarilo
- 👤 K Nautny
- 👤 V Lakomsky
- 👤 A Chvertko
- 👤 A Zherdev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:42
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A plasma-arc furnace for the remelting of sheet-waste material of high-reactivity metals and their alloys, comprising: a chamber for remelting the said sheet-waste material, said chamber having a roof and a melting zone; plasmatrons mounted on the roof of the said chamber; a mould means disposed in a lower part of the said chamber and designed for forming an ingot out of molten sheet-waste material; at least one charging device enclosed in the said chamber and including: an air-tight hopper having a container to accommodate said Sheet-waste material arranged in an upper portion of the said chamber, a water-cooled base-plate having guide troughs mounted between the said container and the mould, and means for feeding said sheet-waste material along the guide troughs of the said base-plate into said melting zone, said means for feeding being located in said chamber substantially under said container.
Claim 2
Dependent Claim
143 words
A plasma-arc furnace for the remelting of sheet-waste material of high-reactivity metals and their alloys, comprising: a chamber for remelting the said sheet-waste material, said chamber having a roof and a melting zone; plasmatrons mounted on the roof of the said chamber; a mould means disposed in a lower part of the said chamber and designed for forming an ingot out of molten sheet-waste material; at least one charging device enclosed in the said chamber and including: an air-tight hopper having a container to accommodate said Sheet-waste material arranged in an upper portion of the said chamber, a water-cooled base-plate having guide troughs mounted between the said container and the mould, and means for feeding said sheet-waste material along the guide troughs of the said base-plate into said melting zone, said means for feeding being located in said chamber substantially under said container.
Claim 3
Dependent Claim
25 words
A plasma-arc furnace as claimed in Claim 1, in which said means for feeding includes a carriage having pusher means for pushing the sheet-waste material.
Claim 4
Dependent Claim
59 words
A plasma-arc furnace as claimed in claim 2, in which the said container has a front wall, and compartments whose lower part is provided with longitudinal through slots formed to let pass said pushers and wherein in a lower part of the front wall of said container there are ports with slides uncovering to let said sheet-waste pass through.
Claim 5
Dependent Claim
23 words
A plasma-arc furnace of as claimed in Claim 1 in which at least two identical charging devices located around said mould are provided.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |