Patent US3909499A successfully refreshed from Google Patents.
US3909499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed reduction furnace
Assignee: Mannesmann Demag AG
•
Filing: 1974-08-05
•
Granted: 1975-09-30
•
Expires: 1994-08-05
Abstract
Abstract A closed reduction furnace with a furnace shell as well as a furnace roof with gas-tight electrode conduits, gas exhaust pipes and charging devices, provided with poking devices traveling around the furnace and spatially movable in three directions is disclosed herein.
Inventors
- 👤 Heinz Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:15
CPC Classifications
F; F27; F27D; F27D25/00; F27D25/001; F27B; F27B3/00; F27B3/08; F27B3/085; F27B3/10; F27B3/12; F27B3/16; F27B3/18; F27B3/183; F27D3/00; F27D2003/0034; F27D2003/0083; F27D2003/0085; F27D2003/0087; F27D99/00; F27D99/0073
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
A closed reduction furnace having a furnace shell and a furnace roof equipped with gas-tight electrode conduits, exhaust pipes and charging devices and poking devices traveling around the furnace, characterized in that a. said furnace roof includes a stationary element and at least one rotary element; b. means sealing the fixed element with respect to the rotary element; and c. gas-tight means mounting said poking device upon said rotary element.
Claim 2
Dependent Claim
70 words
A closed reduction furnace having a furnace shell and a furnace roof equipped with gas-tight electrode conduits, exhaust pipes and charging devices and poking devices traveling around the furnace, characterized in that a. said furnace roof includes a stationary element and at least one rotary element; b. means sealing the fixed element with respect to the rotary element; and c. gas-tight means mounting said poking device upon said rotary element.
Claim 3
Dependent Claim
30 words
A closed reduction furnace in accordance with claim 1, further characterized in that a. said stationary element is circular; b. said rotary element is arranged concentrically with said stationary element.
Claim 4
Dependent Claim
31 words
A closed reduction furnace in accordance with claim 1, further characterized in that a. said rotary element is in the form of a cylinder; b. said cylinder surrounds said stationary element.
Claim 5
Dependent Claim
32 words
A closed reduction furnace in accordance with claim 2, further characterized in that a. said rotary element is sealed against said stationary element and against said furnace shell by sand packing means.
Claim 6
Dependent Claim
36 words
A closed reduction furnace in accordance with claim 4, further including a. roller means which travel on rail means; b. platform means supporting said rail means; c. said rotary element is supported by said roller means.
Claim 7
Dependent Claim
32 words
A closed reduction furnace in accordance with claim 5, further characterized in that a. said sand packing means sealing the rotary element against the stationary element is supported at the stationary element.
Claim 8
Dependent Claim
31 words
A closed reduction furnace in accordance with claim 5, further characterized in that a. the sand packing sealing the rotary element against the furnace shell is supported at the platform means.
Claim 9
Dependent Claim
22 words
A closed reduction furnace in accordance with claim 7, further characterized in that a. said rotary element includes a cylindrical skeleton frame.
Claim 10
Dependent Claim
25 words
A closed reduction furnace in accordance with claim 8, further characterized in that a. brick lining means complete the cylindrical form of said rotary element.
Claim 11
Dependent Claim
28 words
A closed reduction furnace in accordance with claim 8, further characterized in that a. said brick lining means includes individual brick-lined segment means inserted into said skeleton frame.
Claim 12
Dependent Claim
25 words
A closed reduction furnace in accordance with claim 3, further including a. drive means continuously rotating said rotary element; b. said drive means is bi-directional.
Claim 13
Dependent Claim
27 words
A closed reduction furnace in accordance with claim 3, further characterized in that a. drive means radially reciprocate said rotary element with respect to said fixed element.
Claim 14
Dependent Claim
36 words
A closed reduction furnace in accordance with claim 3, further characterized in that a. said rotary element is comprised of hollow wall means; b. flexible piping means connect said wall means with a cooling liquid supply.
Claim 15
Dependent Claim
30 words
A closed reduction furnace in accordance with claim 1, further characterized in that a. said poking means is supported in said rotary element for vertical, two-dimensional movement with respect thereto.
Claim 16
Dependent Claim
27 words
A closed reduction furnace in accordance with claim 1, further characterized in that a. said poking means includes pressure-operated cylinders hingedly mounted to a circular guide track.
Claim 17
Dependent Claim
25 words
A closed reduction furnace in accordance with claim 1, further chaRacterized in that a. said rotary element is in the form of a narrow ring.
Claim 18
Dependent Claim
22 words
A closed reduction furnace in accordance with claim 1, further characterized in that a. said rotary element is equipped with observation devices.
Claim 19
Dependent Claim
25 words
A closed reduction furnace in accordance with claim 1, further characterized in that a. said rotary element is equipped with air supply pipes having dampers.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |